In spectator mode, you can't see whether the UAV is working or not. I don't remember if it was working at the time, or if it was visible on the radar of that player. But I often shoot at the points from which I was killed before (I was killed at the 23rd second from that point, well, or so it seemed to me). It doesn't matter that there was already another player - the situation in the game changes very quickly. In addition, I often shoot without seeing the enemy, intuitively, guided by sounds, tracers, location and behavior of other players.