Now Sarah Jane frowned. "No, I've been here all of one day. It was summer yesterday when I stepped outside...." She listened to Luke carefully, trying to suss out what exactly had been going on. Something tugged at the corners of her memory, a weird feeling of deja vu, but she couldn't make it take hold. All she knew was that she couldn't be in two places at once.
"That...makes sense," she said as Luke offered up his hypothesis. It felt familiar to her, but she had no idea why. It would do as an explanation for now, at least. She was confident that the Doctor could tell them if it was viable. She grinned as Luke began asking questions about the Doctor. "I've mentioned you," she said, "but not really gone into much detail. I haven't had the chance yet. And no, I wouldn't mention the Daleks, just to be on the safe side. If your theory is right, then it might be safe to bring up, but not until we know for sure. We don't want to muck up the time stream."
She was reminded again of the alternate 1980 and Sutekh, and suppressed a shudder. She spied the food and drink on her desk and steered Luke toward it. "He does seem to think that the planet's psychic. And if he thinks it's possible, then I'm sure it is." She picked up the plate and offered him a biscuit. "And, to be fair, we've never thought to ask Mr. Smith about a psychic planet. When we get home, if we remember, we'll have to do just that."
"Lessons?" Sarah Jane thought for a moment. She grinned. Nothing seemed to please the Doctor more than when he could explain something technical to an interested party. Teaching Luke a few things about the TARDIS or whatnot might be just the thing for him. "I think he might be amenable to giving you some lessons," she said. "I don't see the harm in asking, at any rate. Just don't go off galavanting round the universe without telling me, okay?" She winked at Luke.
When he asked about filling her in on the missing time, Sarah Jane's expression turned serious. Part of her did really want to know, just to make sure that everything really had been okay at home while she had been gone. If she had been gone. It seemed harmless, on the surface, for him to tell her what had happened. But, you never knew. "As much as I'd love to hear what you've been doing in my not-quite absence," Sarah Jane said at last, "I think we'd best wait until we know how this all works. If we figure out that your theory is right, then you can tell me, because it won't make a bit of difference in the end, and I can enjoy the news here. If not, you don't want to run the risk of changing the time stream."