[Sans has that same feeling about someone pulling strings. Christine seems to be offering information freely enough for it not to be her, but on the other hand, it's not like he has proof she isn't mixing in some lies. He doesn't want to distrust everyone. Something in him still does, and he doesn't know why.]

I'd say trees aren't supposed to start flickering, but y'know, it's not like I'd remember. [Might as well make a joke about it, then.] But if you can remember--well, if it were me, I'd try to figure out what day it is right now.

[Christine can remember, if he wants to trust her. Therefore, it makes sense to measure the gap of time between the last thing she remembers and today.]