VIDEO: First responders showed an amazing display of teamwork in Sunday night's mass shooting in Las Vegas. Police and medics worked together to get to the victims as fast as they could. The chief of the Clark County Fire Department said training, expert personnel and equipment helped save many lives. Fire and police departments in the greater Phoenix area train for mass-casualty scenarios all the time. Phoenix Fire Capt. Rob McDade hopes his department never has to respond to a mass shooting, but he believes if they do, they are ready.