If we give him defective guns, he may set us up to be shot because of that. Alternatively, we could plant the idea in his head that the best way to see if the guns are truly effective is to test them, leading him to try to test them on
us, leading his men to get blown up potentially
Alternatively, I can try to plant explosives on the wall behind us, and maybe sleight-of-hand the transmitter to blow the wall so I could detonate them at just the right moment. That would give us the blam, and a way to escape. Though, with only
disoriented attackers, and not
no-attackers.
Future-telling makes for exhausting strategic reasoning. Good thing I'm not in a campaign dealing with time travel or anything. No sirree, no plot holes or time paradoxes or anything confusing like that!