were killed when a 42-year-old man went on a shooting spree after getting in a gun fight with police. he allegedly took two people hostage for about three hours. vargas was later shot and killed by police. the hostages were not hurt. back to "caught on camera." welcome back to "caught on camera." i'm contessa brewer. so far we've seen everyday people willing to risk their own lives to save a stranger. we've seen neglect toward a dying woman recorded by surveillance cameras in a psychiatric emergency room. in the next story, people in a pizza parlour are unexpectedly faced with another daunting decision to test their decision to step up when they see something bad going down. it is perhaps one of the most unexpected and brutal knockout punches ever caught on camera outside a boxing ring. >> got the concussion right when he hit me the first time. >> but what is even more shocking may be what happens next.