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Now you are battling Mephisto. He has a ranged energy attack, some melee, and a power that makes you loose control (temporarily) of your team as they run around. In the beginning attack as you would any other enemy. When you notice he drops his sword or if you get close and press X to induce a mini-game to take it from him, use his weapon to destroy the statues surrounding the center circle. Once the statues are gone Jean Grey is back but helping Mephisto. I attacked Jean some then Mephisto some. Mephisto's energy bar eventually turned a shade different from red (a very light purple or maybe a gray) and
then I accidentally ran into Jean who helped put Mephisto away.