His lips quirk into a wry little smile.

"If Sherry drops by, I promise I won't let him shoot you."

(There's not even a gun in the room, although Tony wouldn't put it past Sherlock to find one somewhere if he figured out who was up here. Still, though—and for a brief instant it shows on his face—if it came down to it, and Obie was literally about to kill someone right that second, Tony could do the shooting himself. Short of that it's not happening. Not here.)