Trunks stepped back as she got up in his face, blinking, trying to place her face--but considering he only really knew a bare handful of people, the list came up exceedingly short.

"I'm...sorry, we haven't met."

But he is indeed Bulma's son, though, so he's quick on the uptake. Whoever this is--she must know the younger him, from the timeline he'd just left. Or another one, he wasn't sure.

What else he isn't sure of--he doesn't know if whoever this is has been let in on the fact that he'd come back from the future, but he didn't exactly need to keep it secret anymore. He'd accomplished what he'd set out to do, and considering her words, she'd met him after everything with Cell, and he'd gone back to the future.

"I'm Trunks, yes. Not the one you know."

He'll...just leave it at that.