"Yeah, uh, I don't think I should be telling you about your future, captain." He's seen one too many sci-fi movies, and, if Steve will let him, he'll be taking a step back. "I don't wanna suddenly find myself not existing or something crazy like that. I mean, isn't that, like, the first step to time travel?"

Alternatively, this could all be one massive hallucination from that giant man stunt he pulled.

...That actually has a nice ring to it. Giant-Man and Ant-Man.