Dont fall onto the thought that your attacker will be impressed by being shot, with any service caliber. 1st failures are so numerous, many times the victim or attacker dont realize they are even hit. Its why the one shot stop is also so rare as to be a myth. Assume you will need to land multiple good hits to win your fight, contact to 15-20y. Train & practice that way. I dont know any instructor that teaches draw & fire one shot then evaluate. Its double taps, controlled pairs or hammers, never a single shot.