We talk to Rob Hays, an LAFD firefighter who was enjoying the Route 91 Music Festival in Las Vegas when he suddenly became the 1st 1st responder at the biggest mass shooting in history! Whats it like to run INTO a hail of BULLETS? To not know if anyone, including yourself & your family, will make it out ALIVE? How do you snap from "party mode" to "work mode" in a split second, to answer the call you NEVER saw coming? How do you deal with surviving a mass shooting? Strap in folks!