He doesn't know why this is happening. He doesn't know why she's...pursuing this. Is she worried he's ill? That he's descending in a hurry out of some upset over some poor diagnosis? That is not entirely incorrect - but there's more to it, more which keeps him from being able to stay any longer in good conscience.

So he says, urgently, his voice breaking just a little, "If you call me later over the network, I'll...I will tell you then. Just not...now. I'm - in a great hurry right now."