Oh, right, that's when you popped out to the future? But if you weren't in your universe, then...at least that must mean there's a vortex to connect to that the TARDIS can process here, yeah? Otherwise she wouldn't move...or I s'pose she wouldn't have any power at all unless they had something else hooked up to keep her lit? [Hoho, if she didn't pay attention when she traveled with him, she certainly did when UNIT studied it to make their own time machine.] So there must just be...something keeping her away from it? A barrier or something...I don't know, could they keep her out of synch with it, like the planets were in the Medusa Cascade?