no, thats not the problem, I've had the same things happen. also I've had it where I'll be prone and the guy will be half hidden behind a rock, I snipe him, nothing happens. re-align snipe, nothing happens then magic sub-machine gun one shot kill from across the map. this game has many bugs.
It happens... It sucks when it does.
- General MacArthur
If its like that and its not them spawning invincible its gotta be lag. In the beta there were times where you could empty a clip in a guy while he's doing the same to you and run around for like 15-30 seconds before both of you drop dead out of nowhere.