An adult gets the basics in minutes, and while they may not do it "perfectly", it can still make the difference between life and death. These guys just didn't want to do it...or they believed the guy was injured in a way that CPR wouldn't have done any good.
My exact thought.
CPR wouldn’t have helped and if anything, may have made it worse, with each compression further shredding cardiac tissue on the fragments. This dude was dead from the second he was hit, just took a few minutes to realize it.