It was going to take a lot more than a finger wriggling in his face to freak out a man who'd had his eyeball plucked out of his head by an ex girlfriend and his arm lasered off by Iron Man. A pinky finger was nothing. At her suggestion he raised his eyebrows up almost to his nonexistent hairline. The logistics on the idea were all wrong. Great for a Hollywood action flick or a comic book, maybe, but not really all that feasible for real life. Like first of all, were they getting some actual human trafficking ring involved or just hiring actors or some shit because making all of this up would be a lot more paperwork. Then, if there was a real human trafficking ring, what if Bobbi actually managed to get herself kidnapped and Fury had to go get her ass out and it would ruin the whole thing and maybe she'd lose more than a pinky.
As it was now, though, the way it sounded was that one way or the other she just intended to get kidnapped and end up missing a pinky, which didn't equate to dead and irretrievable. Moreover, the assumption was that if she was dead it was because of his refusal to negotiate with terrorists (not uncharacteristic, true) and the last thing he needed right now was to be held directly responsible for a top agent's death. That would be another nail in his own coffin. This had to work out to both their benefits with minimal headache. Or paperwork.
He could have said all of this to her and shot down her idea, but instead he only shook his head slowly and told her flatly, helpful, "That was a Liam Neeson movie."