For some reason, whenever I watch the video for the champion while playing the game, my game freezes up. Now, what is prety easy to do, is just write down the strategy and bam, no one has to have there game freeze up on them.

How to kill lost brothers

Why can't I go back before killing the lost brothers?

for the champion boss to beat him without enraging him it is best to hit him with the kite shield successfully and then attack when he is fazed from it. (tip: if you're using this strategy I advise you don't use the gauntlet nor using your magic against him.)