This has happened to me before. If I remember correctly I was killed by an enemy then I was looking through the loadout menu when someone revived me then the game glitched for a second and I was in battle with third person. The only thing is that I was viewing my squad leader in third person (like when you are choosing to spawn on someone) but I could also move my guy around, and I was not invincible.
There's a way to be invincible in vehicles. You need help from the admin though. They need to switch you to the other team as soon as you spawn into a vehicle
EDIT: yup that looks like it. see the sniper bullet that would have hit him in the head? maybe it lagged and like the ladder glitch, the game THOUGHT he was somewhere else.
Hmm if this were true, it would be hard to pull off. I'm betting the reaction time is <1 sec in between killing the player and removing control. Anyone want to try this? Add me: Hogart1
Happened to me. Damavand peak. Spawned in the AH-6 only to be put back on the ground, in 3rd person, invincible, with no AH-6. It was destroyed by the Z11 as i spawned in and then that happened. There was only 1 thing to kill me... A knife to the throat...