Based on the close up of the shooting, it looks like he got shot right in the corrotid artery,

There are two carotid arteries. Based on the footage, it looks to me like only his left carotid artery got hit. It would make sense because bullets make a way bigger hole when exiting than they do when entering.
I don’t think anyone, no matter how skilled they are, would be aiming to do that. It’s way more likely to be a failed headshot or shot to the torso.