Rose stood where she was for a few seconds as she considered and processed what the Doctor had just said to her seriously? What is it with futuristic and spacey places like this not being to manage and cater for and sustain a place for everyone to live in and enjoy? Is that really what humanity has to look forward to, living in a big space city that can barely sustain itself? She thought and wondered. That was when she came back to reality and realised the Doctor had gone ahead of her. She then hurried around the corner but then stopped short when she didn't see the Doctor ahead of her eh?...where- but it's only been a few seconds…oh god I've lost him already… Rose thought.
The trouble was that there were no side alleys that the Doctor could've stepped down, no doorways he could've gone into and entered through, or even hid behind just to play a silly joke on her for being a bit slow 'Doctor?!' Rose shouted, but she still didn't see any sign of him.
Rose looked back the way she had come then back to the street ahead with the distant crowd of people going about their lives and business I can't BELIEVE…he wouldn't just abandon me here or leave me alone like this…she began to think before she once again looked back the way she had come well at least the TARDIS is still here, so he's bound to be back eventually, wherever the hell he's gone, he wouldn't just leave the TARDIS here as well. In that moment Rose quickly went back around the corner and saw the TARDIS still standing where the Doctor had parked it to which she breathed a sigh of relief, which dispelled the irrational and almost panic inducing thought that the TARDIS too might have vanished like the DOCTOR had good, thank god, no way am I going to walk around this place and get lost trying to find the Doctor she thought.
So now there she was standing inside the TARDIS wondering what to do with herself until the Doctor returned. What she didn't know was that she wasn't going to have to wait long, as while she sat in the TARDIS wondering what to do to pass the time the handbrake lever, as if pulled by an invisible hand, person or some unseen force, went down and the TARDIS began to rock and shake throwing Rose against the console while she stood up to look at and review the controls.
As Rose gripped the console tightly she said out loud 'what are you doing?! The Doctor's still out there! Where are we going?' what she didn't realise and see was that there were flashing words on the scanner screen "Emergency Protocols Active"…

The Eleventh Doctor abruptly sat up, and after looking around at where he was realised he was at the edge of a lake with a sizeable island in the middle of it, which in the middle of the island itself were four tall, arcing steel arms reaching up to the bright blue, almost cloudless sky as if in an almost feeble attempt to claw at it. That's what they looked like, claws like the Doctor's sonic screwdriver except with four instead of three.
Coming from and being emitted from the very middle of the island was a streaming pillar of blue energy flowing right up and through some clouds in the sky to…well, wherever it was going to. Upon looking at the sky the Doctor thought he noticed something odd about it, like it had an unrealistic look to it…that was when the Doctor abruptly looked forwards again in the direction of the island. 'This place…' the Doctor began as his eyes repeatedly darted to each side 'why…do I recognise it? Seriously I feel like I know, or should know this place, like an annoyingly nagging feeling of Déjà vu that I've been here before' the Doctor continued, lightly slapping his face a bit as he said the last few words.
He then paused in sudden thought and realization as he realised that his unexpectedly surprising familiarity with the place was because he had been here before in previous times, previous lives 'oh…oh right yes I get it now, well that explains that, as for the rest…well, we'll just have to a nosy look around…' the Doctor said as he shifted his gaze to the nearby treeline that surrounded the small clearing at the edge of the lake where he was…

Somewhere in a densely forested part quite some way from the lake side a big thick and burly steel door rose with a slight groan before stopping more than eight feet above the ground. What emerged through the open doorway a few seconds later, paw by paw, was a sizeable beast that had some cross-resemblance between a lion and a tiger, though more or less the former with its mane which wasn't as thick as that of a typical lion but it was enough to provide some resemblance.
Sharp, pointed spikes protruded from each side of its somewhat large head, three on each side with sharp teeth and fangs. After the beast gradually stepped out into the light it was followed by one…two…three more of the same beast, each stopping right beside each other, four in a row sniffing the air, before the beast that had stepped out first gave a loud roar…
While this happened, each of the four Doctors halted where they were each separately treading and looked up and around at as they heard the roar that, unknown to them, belonged to one of four beasts with a bloodthirsty intent. 'Oooookkkkk, that is quite loud yet quite far off…I'm going to need to keep my wits about me, something tells me I should' said each of the four Doctors out loud to themselves.