"I didn't know if people could come through-as so far as I could tell, only things. I wanted to make sure it wasn't going to keep happening to me. And what proof did I have? Someone shows up one day wanting to know about things that are only theoretical to everyone else." He wasn't going to mention the holes in what timeline he could find on Jack. For the same reason he kept his own history to himself. Some things were hard to explain without taking logic into account. He met Jack's eyes and offered a slight smile. "Plus I'm not fond of being Retconned."