Really Dumb Move, for A Movie that Is supposed to be realistic
I don't expect movies like this to reflect accurate tactical realism documentary style. But Mamet made a big deal about being all macho and real by getting help from real experts in the field.
But this scene was just total stupidity for even Hardy Boys. When Scott was getting away from that faked escape setup at the diner with that Arab pimp as a "partner", he is soon followed by his sidekick Curtis who buttonholes him in the middle of the pharmacy. That was such a blatant and stupid move. Why didn't they have some sort of pre-arranged way to pass him a message covertly, like call him on a cell phone? Talking in the cash register line about the mission seemed so utterly incompetent. Then to top it off, why would Scott further risk blowing his cover and risking police involvement by suddenly asking Curtis for his guns? He already had a gun or two and if he needed more, why not grab them before he left the diner? After all, he seemed quite capable of dealing with his prisoner even unarmed.