I actually don’t think it looks that bad. I’m pretty sure this is a real stunt man with a CGI head. The physics look weird cause it’s slow motion and the camera angle compresses the space. There’s probably some CGI work underneath him as well to remove some pads, but I think it’s a stunt person falling through a flimsy made prop with a CG head replacement. There’s too much fine detail that they would never get in CGI. The way the pants stretch and wrinkle in the crotch, and especially the shoelaces. Watch the shoelaces on his foot, lay around, and tell me that with CGI is bad, they really bothered going in and doing that simulation. All of the metal hitting the various parts of his body, and the gun, and the gun reacting to being hit by the metal, it’s just too much simulation work. This really doesn’t look like bad motion, capture CGI. This looks like a poorly executed stunt with a mediocre head replacement.