I think that's the point @CoffeeLover90, that it doesn't matter who the victim is really, it is highlighting how devastating it is for the puncher who never intended to kill someone, the puncher's family and friends, the victim's family. The odd camera work with everyone staring at Dan I guess was to show Dan's guilt.
I like Cain's supportive role to Dan as he knows exactly how Dan is feeling as he thought he had killed Joe Tate with one punch.