'Cause if I can't handle a couple of crooks, I ain't cut out for my line of work.

[She might not be a soldier anymore, but that hardly means she's let herself get rusty. It's important that she doesn't need to rely on anyone else, because 99% of the time, she can't. Trust is a rare commodity.]

It's not about you being useful. [She gets it, really, why this is troubling him, but she's not going to budge.] You handle the first bit, let me deal with the rest.