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Stun him at low health then do the QTEs: tap square, X, tap O to unlock this trophy. Athough this QTE puts you in gear 2nd you can do this without 3 bars of meter. Good luck on this one by the way... he starts only countering after 2/3 life which makes it tough to find an opening to stun him. I lucked out by barely dodging his avalanche attack.