"He ran in the house hysterical like 'mom, mom, there's a guy out there with the cops saying freeze, freeze' and we're like what what's going on and we went outside to look, like we just saw the cops, and they say 'go back in the house.'"
http://www.lasvegasnow.com/news/family-of-unarmed-man-killed-by-police-speaks-out
In this amount of time why didn't he stop and drop his phone? If the officers thought he had a gun I can understand their concerns for the safety of the neighbors. They were in a very bad situation IMO.