If he's not developing the game your friend is most likely not a legend in the eyes of your peers. He's just another player, apparently with issues. If he carried the whole team there and then got angry they couldn't legitimately kill the current final boss of the game he should have foreseen them not being able to, or at least some aspect of his "legendary" self would have clued him into this long before trying to fight Crota. If he wants to beat legit, make that clear at the beginning. If he's any good and has any common sense that's how he would have went about this issue in the first place. Why is everyone so mired in destroying others' days?