he was a hunter at the lamps and somehow he was magically a warlock at crota...hmmmm.....still..... good job killing crota
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He explains it in the video, he uses a warlock because of the 2 fusion grenades and using his super to regen health and throw more grenades. Its pretty much impossible for a hunter to solo it bc they don't have good enough grenades and their super doesn't help out so much during this fight.