"Ya think?" Yes, he knows Nat's moves. This Nat fights like his Nat, as his fresh bruises can readily attest. And he knows her moves. Which is why he also knows that this momentary hesitation is either going to turn into reconciliation, or she's going to break his nose with her forehead the second he relaxes.

"Okay, look: I've got an ID card in my wallet. Avengers ID. I'm not Agent anything, I don't have laser cigarettes or, or exploding pens. Just lemme get my wallet, and I can show you my card. Also, I'm gonna need a sec to put my hearing aids back in."