Irenic, if I look at the video, it appears the belt buckle is centered where it should be. There is one segment where you can see the glint of the buckle (around 50 sec.). In the picture you show, the belt is unbuckled. Then in the one where he is flung over someone’s shoulder, it appears his pants are down, or not on.
In all of the pictures, I would guess he is already dead. It appears rigor mortis has set in to the eyelids, the bent arm. In the video, his arm and body is motionless on the ground. He is either dead or knocked out, IMO.
I think he was still alive in that picture where his eyes are open.
And sometime in between that picture and the one where hes flung over the shoulder, he was killed. Because of his eyes
In the first picture his eyes are still open. But in the shoulder one they are closed. If he was already killed at this point it’s doubtful they closed his eyes out of respect.
That tells me he was still alive in those pictures where he was on the ground with his pants on and eyes open.