As she bumps into him, Tony takes a step back, a developed habit from having Happy as his bodyguard for the last decade, he was used to the man getting in the way and keeping anyone from bumping into him from doing it again.

Realising Happy wasn't there he felt a little silly, and just readjusted his jacket.

"Well, you bumped into me so..."

He raised his eyebrow at her smile, nothing he wasn't used to but didn't think he'd literally run into it so soon.

"You think I'm tall?"

He realises that really shouldn't be his first thought here. But after spending time with the Avengers, Tony started to develop a vague height complex.