Because according to the videos posted here, he was clearly hit in the chest.
(Protective) custody perhaps.
Literally looks like a balloon under his shirt if you look closely and he gets hit with the force of something I can't even see, right in the front on his left side chest.
In the slowed down video, looks like it hits him in the chest, his shirt moves upward, then the shirt comes back down and there's a bullet hole. No marks on his shirt.