crowded streets turn chaotic -- (nats -- gun pops) (haley delmonte/naples) "we heard a bunch of shots so we kind of ran." after a gunman opens fire in the heart of downtown fort myers saturday night. (haley delmonte/naples) "we saw a guy who was laying on the ground, he was obviously already passed. and there was someone else that got shot, and then they took another man out on a stretcher." (gabe santa rita/downtown) "one of the girls was over there crying, another one laughing like she didn't believe it." the whole thing playing out in front of hundreds gathered for the annual "zombicon" event. (nats of crowds screaming/running) the sound sent crowds running for safety -- many in fear for their lives. (bronson robinson/cape coral) "i really didn't believe it because i thought it was part of what happened tonight." (haley delmonte/naples) "we didn't know if it was real or fake. we ran, then we were like, wait, was that real? so we went back, people were screaming 'it was fake.'" police tell us the bullets struck five people -- killing one of them. the body laying just feet away from