The only one of the Mercer boys who didn't grow up with (apparently) innate skills for gunplay and ass-kicking, Jack is basically the damsel in distress within a family full of guys. His death is tragic, but when he's falling for obvious traps (i.e., chasing a hoody-wearing, clearly malevolent kid who just tossed a snowball at his face) as easily as he does, it's kind of inevitable.