I don't think he is a hacker.
The killcam looks like you were not even shooting ... so probably just lag.
not a hacker. Its just the game does this sometimes. I have had this as the person that cant be killed and a few games where i cant kill someone. Something to do with the loading. Bit like when you kill at the players in S n D but the game doesn't end.
Yea but it happened 2 times and only by that guy. I did only stay in the game for around 2 mins but I did kill a few others no problem.