I think that this strategy relies on assumptions about the mindset of the shooter that can't be counted on. While some people may stop and consider why the shot didn't go off, I expect that most would react instead by pulling the trigger again. That's what I'd do, it's probably what most novices would do as well.
So intead of ... CLICK- HMMM? , it's CLICK-ACK!-BOOMBOOMBOOM