They have to give due warning before they shoot, even if it is 7 times. Two coppers, two guns, one fired 3 times, one 4 times - would have taken about 2 seconds in all with automatics. If UK Police shoot, it is always to kill - they are only allowed to shoot if they believe that the lives of others or themselves are in imminent danger, thus they shoot to kill, the idea that they can shoot to wound or disable is TV show fantasy. One shot to the head does not guarantee a kill and so could mean that a bomb could be detonated. 7 shots is grim but understandable. Besides 7 shots or 1 shot, the poor sod is still dead. The precise number of bullets expended is a bit of a sideshow.