[It's a successful way to slow him down, at least! Not that he's very happy about it, since he's definitely spinning on his heel and taking a step toward her as soon as she stops him.]

Look. [He also aggressively jabs a finger in her general direction like the charming gentleman he is...]

I like, don't care if you believe me or not. I shouldn't be talking to you at all! But I don't have time to stand around explaining something you're not even supposed to be involved in. We're in the middle of a mission, got it? And one of my comrades is MIA. [Jabbing her chestplate!!] You wanna talk, then we'll talk after we find Yasusada. Af-ter!