Concerned me too, but I think LE knew he was dead. Did you notice the elongated area extending away from the top of his head? I don't think that's a shadow because it's too long. I think it may be blood and brain matter that sprayed out. In the video I did hear one of the individual's comment that his brains were on the street. LE knew they couldn't do anything for him. Preserving the dignity of a deceased person is probably not anything they concern themselves with. I find that very disturbing.
It was a possible crime scene. Cops didn't want to disturb or contaminate it in any way.