The mirror world was a strange place. It looked mostly like the warehouse, but through two opposite mirrors, reflected back and forwards to infinity. There were the support frames into which the mirrors had been installed in the real world, yet not only were they lacking the actual mirrors, but there were so many of them, a truly infinite line of frames, in parallel left and right of Harry. Behind each of them was another corridor, and another. Dozens or more, perhaps, thanks to the artificial nature of this place. It was rather confusing to look at. Aside from the grief that his mind still had to process, just staring into the infinity of this place gave Harry a good headache. The walls and roof of the warehouse itself, as well as the far ends of the corridors were all lost in a thick, white mist, which was the only thing that helped to make the nature of this world a little easier to process by a human brain. Even so, the mist itself, too, had a very bizarre nature to it: Though Harry was still running, he never got any closer to it. Whatever it was, it was not natural, that was for sure.

As it soon turned out, it really did not matter how far Harry ran, or into which direction. There was simply no end to the corridor, and no wall or roof of the warehouse ever came into sight. At some point, the soldier had vanished in the distance Harry had put behind himself, and he was left alone eventually. Although he was seemingly in no immediate danger any more, he also had no idea where he was now. Everything looked the same, and this world was, as far as he could tell, indeed infinite.

The medical officer slowed his steps, although breathing heavily, to get a better look at his surroundings. Every couple of yards, there was a tetrahedron lying on the floor near the bottom of the support frames. Obviously, none of them were real, and Harry did not dare to mess with them, anyway. After everything he had seen he was even less keen to inspect them again. These kind of matters, he preferred to leave to the Doctor.

The Doctor and Sarah…

The thought brought images of his friends to his mind. What if they had been attacked as well? Although Harry knew the Time Lord could pack a punch, and Sarah could get surprisingly violent if attacked, he was afraid that they could hardly hold their ground against a reflection, let alone two or more. Aside from that, the Doctor was still affected by his steadily changing metabolism, and another sudden feeling of faintness was, in consequence, most certainly not just his end, but the end of both of them, given Sarah's total commitment to saving his life.

Harry stopped, trying to catch his breath again since his slow walking had not helped much. He leaned forwards onto his knees, bowing his head down as he was suddenly feeling rather hopeless. Lost, in a pocket universe filled with sentient, super-strong, malicious reflections. Clara was dead, and for all he knew his friends might be dead already as well. The medical officer forced himself by the power of his will to take a few deep, steady breaths. He didn't want to succumb to what both the pessimist and the realist inside of him told him, though truth be spoken: He had never been much of an optimist, either. As he forced his thoughts back on track, he pressed his eyes firmly shut.
If he was in this world and still alive, so might be the Doctor, Sarah, Benton, Liz and everyone else as well!

It was at that moment as he stood still, that he heard the distant voices. Though the words were unintelligible at first, they soon became clearer, just as the distinctive timbre of the voice Harry was familiar with.

"..How should I know how to get out of here? I don't have an answer to everything, you know?"

"Then make a few assumptions, and let's theorize about it!"

Harry took a deep breath and sighed in relief, muttering to himself: "Oh, Sarah, old girl…!" This slightly cheerful, high-pitched voice… She wouldn't believe him how glad he was to hear it, even if he had the words to describe the feeling to her. Once the dark thoughts had broken away from his mind, the medical officer stood up straight again and began to move about, now trying to identify the direction the voices were coming from.

"It's a pocket universe.", said the Doctor, as they thankfully continued talking. "There, that's as good as my assumption gets at the moment."

Quickly, Harry settled on a cardinal direction and hurried his steps. "Doctor!", he called out for his friends. "Sarah!"

Yet they went on with their conversation as though they couldn't hear him.
"Well, here's another one: Say, we went in through a mirror, so maybe we go out through a mirror?", Sarah suggested, but her idea was dismissed by the Doctor within the following second.

"Now that's just silly, Sarah. Why would they put a mirror inside a mirror, hm? Or have you spotted one yet?"

The white light cleared in the distance and three large blobs of colour became visible. One was dark blue, one brown, and one sort of redd-ish. The coat Sarah had borrowed from her aunt had a not very fashionable red plaid pattern… But as Harry closed in on his friends, he halted abruptly and stared back at them, just as they were staring at him.

Sarah and the Doctor, although both of them were still in good health, were accompanied by someone else. Harry's gaze met the pale-coloured eyes of the third man, and they blinked at each with the exact identical, puzzled expression on their faces. From the tiny dark curls on his head down to the shine of his shoes, the stranger was a perfect copy of the medical officer.

"Careful, Doctor! He's a reflection!", Harry and his counterpart said in unison while also pointing at each other.

"You better step away from-" A short fright washed over him as he attempted to continue speaking on his own, but the reflection was mimicking him perfectly. Like this, his friends wouldn't be able to tell the difference!

However, they had realized by themselves the danger they were in. The Doctor placed a hand on Sarah's shoulder before he began to take several steps back from the false Harry who must have accompanied them in the mirror world so far. Through his non-verbal instruction, the young woman stayed close to him while at the same time, her gaze went back and forth between Harry and his image as she most likely tried to spot a difference between them.

"What are you doing, Doctor?", the reflection suddenly began to speak out of its own accord. It responded to the half-Time Lord's suspicious glare with a clueless shrug. "Can you not tell that he is the copy? Now, I've been with you this whole time, haven't I?"

A shiver ran down Harry's spine to see his reflection talk and walk, much like he would himself. Any other image he had encountered so far was driven by the most basic instruction to kill… or to pull someone in, but this one was doing a bloody good job at trying to fool his friends. "He's lying!", Harry blurted out like a school kid, who lacked any real evidence and just wanted someone to be punished by the teacher. Pointing at the reflection once more failed to give more credibility to his statement as well.

"Harry...", the Doctor addressed both of them. His glare was directed at both, and he slightly dragged out the officer's name as he spoke it. "...Why don't you tell us something only the real one of you would know?" He stood close behind Sarah with a hand on her arm, ready to pull her further away with him if one of the medical officers made a false move towards them.

"Come now, Doctor. You know I'm rubbish at those mind games.", complained Harry. How was he supposed to know what bit of his identity the reflection had or had not copied along with his appearance? He was a doctor, one who had specialized in ailments of the body, not a psychiatrist. Harry always liked his problems to be physical, measurable, and real. Then again, that train of thought reminded him of something else: There was a rather simple way to prove his identity, as his sore fist had witnessed earlier…
"Unlike me, that lad over there isn't even a being of flesh and blood. His physiology is that of a brick wall!" Harry nodded towards his copy.

"Excuse me?" Said reflection raised an eyebrow at him, seemingly feeling offended. The cheek! Harry was indeed offended, but by the copy's insolence of trying to imitate his feelings.

The Doctor blinked at Harry, unimpressed by his impossible suggestion. "I will hardly throw a punch at him just to confirm your point, will I?"

"Eh.. Yes, I suppose it's better you don't.", stammered the original, as he realized that his suggestion was, after all, probably vastly dangerous to begin with. In secret, Harry wished he had kept his mouth shut.

"Well, then, you've had your try.", stated the reflection and shot him a brief, angry glare before turning back to the Doctor and Sarah. It was acting mostly casual while attempting to answer to the Doctor's original request. "Here's something only we would know: Two weeks back the Doctor and I went out to the sea. There was an… accident and we were thrown overboard."

"If you're telling him that old story you might as well remind him that it was his fault, after all.", huffed Harry at his counterpart. He had said it without thinking much into it, the words came straight off his head this time. "Maybe I let go of the rope too early, but he's too darn stubborn to admit he's got no clue how to tie a proper sailor's knot."

"We've been over this already, Harry.", responded the Doctor, mildly annoyed by the accusation.

"What does that matter at a time like this?" The reflection turned to Harry quite suddenly, and he thought he caught a glimpse of a malicious thought in its eyes. Apparently it was upset that he was about to head into an argument.

But Harry stood tall. "Everything matters!", he insisted and even dared to raise his voice a little. Something he did very rarely, but he felt it was important right now. Desperate to further prove his point, Harry started pacing around and flailing his arms a bit as he sought hard for the words to give them another example.

"Like, back at UNIT… Like, that time Sarah stole a box of tea from my office!"

"It was for a very important guest!" Sarah defended herself instantly.

"Yes, I know, old girl.", Harry nodded at her understandingly, before he explained what it was about her action that had upset him. "You could have asked, still."

It was a matter of etiquette, of character and attitude. Of course he didn't care about the tea, he cared about Sarah! Care, by his definition, was not just about keeping another safe, but about wanting them to improve their personality, moral or skill, as well. Maybe Harry lacked the right words to explain it just like it was, but it was the way he felt. And thanks to the reflection's insolent way of imitating him, the emotion was particularly strong with him right now. He shot the tall man behind Sarah a strict look. "And just while we're at it: Doctor?"

"What else?", he responded, nowhere less annoyed than he had been before.

Harry took a breath and then said, as fluently as though he had practised the sentence: "I want you to apologize to Sarah sometime, because she has been worried sick about you."

Barely had he finished the sentence as the upset expression fell away from the Doctor's face. Instead, he looked puzzled back at Harry first, before he turned his gaze to Sarah, just at the same time as she looked up at him in return. The Doctor shrugged, then shook his head with his brows furrowed in a way that spoke an inaudible "Sorry, I didn't realize…!".

"It's really not necessary, Doctor… It wasn't your fault.", Sarah quickly reassured him, rolling her eyes to signify the unimportance of it, though if Harry had read her facial expression correctly, then she was also slightly embarrassed that he had brought it up at all. Without him to tell, the Doctor would never know what she had been through in his month-long absence.

"You're just trying to distract from the obvious!", Harry's own voice cut through the arising silence as the reflection accused him. "In case you've forgotten, we're stuck here. There are more important matters at hand!" It was downright angry now at him, and he suddenly thought he looked rather fearsome when upset. Though, that might have been just his impression since he was so far the only one who knew what that thing really was.

Just in the moment the reflection took a step towards Harry, the Doctor, too, stepped forwards. "I don't think so!", he decided, before he shot the medical officer a glance and a confident smile. He had figured it out! "You see, Harry – the real Harry over there – he's right. The little things in life do matter, especially to him."

As Sarah smiled happily at the original and waved him over, Harry let out another big sigh of relief, before he finally hurried to catch up with his friends. All the while, his reflection stared at them, perplexed at its own defeat.

"And you said you're rubbish at this.", Sarah chuckled at him, receiving an endlessly glad smile from Harry in return.

The Doctor then cut straight back to business. "Why have you followed us into the pocket universe, Harry? Did they drag you in, too?"

He was almost about to tell them about Clara, but before he could get a word out, his sight fell past the Doctor at the reflection, which had just lost its human-like liveliness and the same old, disturbingly mechanical look returned to its eyes. About the same time, two more reflections emerged from the mist. This time, they were copies of the Doctor and Sarah...

"I'm sorry, Doctor, but I believe the storytelling has to wait...", Harry hinted at the brewing danger, they all turned to follow his gaze, and then the next thing he knew they were running again.