Again with my "how do you do X from game Y" question.

So Bobby is acting all agitated, and I think he may be ready to escalate into violence. I don't want to be the one to start the shooting, so I wanna wait and see what he does.

What's the move?

In "other" games, this might be using a Delay Action on my Initiative. Then pulling out my shooter once I see Bobby going for his gun.

But here?

Acting under fire? Or is this just Going aggro, but with some "conditions"?