This shot seems to be a mix of shots. It's a close up shot of the legs, but also the torso of Witwer after he was shot by Burgess which is a medium shot.
This shot is created to show dominance of Burgess. It also frames Witwer as a victim. And interestingly the blood stain seems to be right in the center of the shot. Burgess is not shown completely and you only see his dark legs. We see Burgess from the bottom which shows dominance. The darkness of the legs shows the darkness of his character. Witwer is on the ground and we see his torso which possibly means we're down on his level looking up. We can also see his eyes looking up. The blood stain is in the center so the eye automatically goes to it and we see that he's hurt. This shot is created to show the badness of the bad guy. He is shown as strong and the "good guy" is gonna die.