louis is casing more questions about how police use deadly force, john hendry reports. >> reporter: thed shooting here might have happened in many segregated american towns and a few days later one did. not far away in st. louis. on tuesday a store owner accused a man of shoplifting this mobile phone video shows what happened next. [ gunshots ] >> oh, my god. >> reporter: watching that video, it's hard to understand why he was taunting police. the people in the neighborhood say they understand. they say young black men feel disrespected by authorities. but when he shouted shoot me, no one expected the officers to pull the trigger. >> i think that they could have used a taser, or they could have used mace. >> we are human beings, man. like i feel like nobody, like god says, like geez you go says, nobody should just kill somebody. you can't be able to kill somebody. if that's the case, hey, -- let's go, let everybody go. >> reporter: but some police training experts say a threatened officer has little choice. >> why don't officer shoot for limbs, why don't they shoot the arm, the leg, rea