When he hears someone approach, he's instantly on alert, though he tries to keep that subtle. No point in scaring off a helping hand when he desperately needs one. The second she says his name, though, that facade drops. He's on his feet -- well, mostly just on one -- and looking at her warily. Whoever she is, she doesn't have any reason to know his name, which means that someone sent her here. SHIELD? The military? An unrelated but probably equally unsafe alternative? It seems pretty strange for a woman to be approaching him, alone, when she presumably knows who he is.

Which means that she isn't alone. His eyes dart quickly behind her on either side, but he can't see anyone yet, and he should probably respond.

"Do I know you?"