"Really?", Jack said, surprised and intrigued, "He did that?"

But no, there was hardly time for history lessons of quantum mechanics. They'd be plenty for that later. Or at least there would if they got out of this room without being crushed.

His own gaze scanned the room. He looked for ideas or clues but nothing really made sense to him here, nothing but the Doctor. Everything that had seemed obvious so far had been a trap, so perhaps it was logical to look for the things that didn't seem obvious... but that didn't really he--

His train of thought was stopped and he spun his head over to the Doctor with a grin. "Well brilliant! What is it?"