Aiden stared in horror, but only for a moment. The next second he was up, sick with worry for his two sisters. Without coherent thought, he scaled the boulders like a madman, searching for a way through.

Then everything stopped. Just stopped. The light from the emergency lamps vanished. All sound fell away. There was no heat, and his mind was blank. Even time had no meaning. He was in a great sea of nothing, only aware of his fragile heartbeat.

Toump toump.

Toump toump.

Toump toump.

Then everything came rushing back in, a burst of sensations and thought that nearly made him lose his grip on the rocks. A heaving gasp and a sickening crack drew his attention downwards towards Katie.

Her eyes were wide open, her chest heaving as she desperately tried to pull in air. Aiden watched with horrified fascination as joints that had only moments before been bending the wrong way moved back to where they belonged, and pulverized flesh reconstructed itself.

He went into a controlled slide down the rocks to Katie, keeping his distance from her. She lay still as she brought her breath under control.

"That was…that was…what was that?" she gasped out. Aiden shook his head mutely.

Katie started moving, slowly at first as her muscles rebuilt, then enough to stand again. She stared at Aiden, who was beginning to realize she was as confused as he was.

"You died," he said, the sentence a fact. Then his face screwed up. "You…died. You were dead!"

Katie nodded and swallowed. "Yeah. I guess I was."

"And now you're not?"

"And now I'm not."

Aiden looked at her, confused. "Does that happen often? The dying thing?"

"First time." Katie straightened with a jerk. "The others!"

Aiden had already started for the boulders when he realized that Katie wasn't behind him. She was frantically searching through her bag. She stopped and groaned.

"You have got to be kidding me," she said as she held up a mechanical device of some kind. Whatever it had been, it was now crushed beyond repair.

"Damn rocks broke it!"

"What was it?" Aiden asked.

"My TARDIS communicator," Katie said. "At least, that's what I call it. It sends a digital signal through space, even time if need be. I had to work for three weeks to find the parts, and it took me another three days to build it!"

Aiden's hops fell with his face. "So we can't reach them."

Katie sighed, shaking her head. "Nope." She smiled light at Aiden. "Don't worry too much. Your sisters are with the Doctor. He'll keep them safe."

And himself. I hope.

At that moment, the Doctor was a bit more concerned about what was wrong with Jaya then getting them to the TARDIS. There wasn't a mark on her, but she was shrieking so loud he was beginning to worry that she would bring the caves down again. At least the Angel's had booked it while the dust hid them. Where they had gone was anyone's worry.

"Jaya, it's okay. No one's hurt," Katrina soothed.

"Aiden!" she screamed again, struggling to get to the wall of rock that separated them from Katie and Aiden.

"I'm sure Aiden's fine. Katie's with him, right Doctor?"

"Oh sure," the Doctor said, hands in his trouser pockets. "Definitely. They'll be alright."

"See now?" Katrina said with a smile. "Nothing to worry about."

"Is too!" Jaya cried, her shrieks deteriorating into sobs. "They won't come back."

"Yes they will!" Katrina insisted gently. "All the tunnels are connected to this main one. Aiden will get them both back, safe and sound."

"No, he won't. Only one is coming back."

Katrina and the Doctor shared a glance. "Jaya, you can't know that," Katrina said, even as she remembered the other—correct—predictions.

"Can too."

The Doctor crouched down in front of Jaya, his look penetrating. "Jaya, I know that you see things, and I know that they're right. But I don't think you know Katie very well. If she's with Aiden, she'll keep him safe."

And herself as well. I hope.

"So Burrow Boy, any alternate routes?"

"Depends. Can you tell me where you were?"

Katie stared at him blankly. "How should I know? You people didn't exactly put up sign posts."

"Let me put it this way," Aiden said, irritation creeping into his voice. "We are in the Central Tunnel, the main road from the city to the surface. There are other tunnels coming off of this one, mostly tunnels used for mining. Were you in the Central Tunnel, or one of the offshoots?"

"An off shoot."

"How much further down from where we were before the cave in?"

"Maybe…a quarter mile?"

"You were certainly close to the surface entrance," Aiden mused. He rubbed his fingers together, thinking. Katie closed her eyes, watching the purple draw in towards him. Of course, she could barely see it through the silver haze.

"There's a parallel shaft to this one, Obsidian Hall. Lots of obsidian in that one. The only one with it, though we never could figure out why. We need to backtrack and go along Boron's outskirts until we can get to it. From there we can find a way back into the Central Tunnel and your ship."

"She's not my ship. She's got a mind of her own. The Doctor's so old he forgets that."

"Your father can't be more than thirty-five," Aiden scoffed.

Katie glared at him. "The Doctor is not my father. And he's a lot older than you might think." She waved her hand at Aiden. "Now lead the way. We need to get back."

It took thirty minutes to reach Obsidian Hall. The entire tunnel almost looked like it was made of black glass. It was pretty, in a threatening sort of way.

"Aiden, help me out here for a moment: Do your tunnels often collapse?"

Aiden thought about the question. "No. First time that I know of, actually. It's solid rock down here. No earth to shore up. As long as we check for and fix any natural fissures, nothing ever falls in."

"Then why would the Central Tunnel suddenly collapse?"

"Don't know. But now you have me worried Obsidian will do the same."

Katie shook her head. "No, I don't think you need to fret about that. Speaking from experience, you can do a lot with energy. Sound waves, heat waves, even light if it's packed down enough. I get the feeling the Angels pulled something."

"Why would they bring the tunnel crashing in on us?" Aiden asked.

"Divide and conquer. Oldest trick in the book. They knew that if the Doctor was nearby, any chance of putting me to good use was non-existent. And what with TARDIS damaged, he can't go searching for us."

"Do you think the Doctor will be able to fix your…"Aiden caught Katie's look. "To fix TARDIS?"

"Course he will. Wizard at fixing stuff, especially her. He and TARDIS, TARDIS and he, the perfect pair, always know how to help the other. He'll set her to rights, don't worry."

"But he hasn't got the glass," Aiden argued.

Katie answered the protest with a confident note. "Oh, the vortex manipulator isn't that big, you wouldn't need a lot of glass for it. He'll find some hidden in the rooms. It'll be fine."

"Are you lying to me?"

"Yes I am."

Aiden smiled wryly, but said nothing. Katie, as was her habit, broke the silence a minute later. "What's the door for?" she asked, pointing to a solid wood door that looked quite out of place in the rock wall.

"Oh, that's one of the storage areas. We keep blasting things there."

Katie raised an eyebrow. "We're in the year some-odd million and you still use explosives? You haven't gone to lasers yet?"

"Drilling laser's take a lot of power, power that we can't spare often," Aiden answered. "The city comes first. We do have lasers, but you have to go through a lot of red tape to use one, and even then the use is limited."

"Where do you keep the fancy drills?"

"Some place up ahead. Near where we need to be actually. Once I see my sisters, I could show you."

"Sure why…" Katie's voice trailed away as she swayed. Aiden looked concerned.

"You alright?"

Katie smiled at him in a slightly dreamlike state. "Yeah. Yeah sure, just a little tired."

Aiden looked oddly at Katie. "Your eyes look funny."

"Just tired," Katie said, stepping forward and waving her hand in the air. She continued around the corner and abruptly stopped.

"Oh. That's why my head's foggy."

Aiden came to stand next to her. "I suppose so."

Obsidian Hall was full of Weeping Angels.

*Constructive critisisim welcome, praise happily accepted, flames not wanted*