Pulling a gun from out of nowhere would be a feat he wished he had the capacity of performing, but that would require having a gun, and perhaps for his other arm to not be tucked against his body in a sling while his gunshot wound heals.

And as postulated, the reference goes completely over his head, and he even glances around the theater before looking back to Dave in befuddlement. As for having a weapon pointed at him, he wastes no time in pulling out his own, well acquainted with the weight of it by now, and poised to fight even with his handicap.

"Statement: This is a theater." Four for you, Captain Obvious.