Sentinel you're the second (possibly third) murderer he's put on probation. So when he gets that "no", his head slowly turns towards the other, eyes wide and...angry.

"It's funny, Sentinel. I don't believe I gave you the option."

His voice loses that evenness. Instead of a tired, wartorn tone, it's full of authority, and boy is it pissed. He's ready to throw you into that crater any second now if you keep that lip up.