All the time, freeze melee does it to. I assume its the garbage p2p latency. Same thing that causes the teleporting melee's we see all the time. It's as if the game says you died before you cast it, so you see the animation, but the connection doesn't send it. To bad it consumes the ability charge when the connection clearly did not allow the ability to take effect. Don't worry Bungie will nerf the exotic to make it more worthless.... Oh wait