So I think what happened was, when Demon's Tide got around the "4 bars of HP mark" where he prepares to swirl into the ground and enter his 2nd phase, I started hitting him with a large barrage of magic (Firaga, Blizzaga, Firaja, Blizzaja) and I /think/ I did so much damage that I caused him to basically skip his 2nd phase and remain in his first while still doing the majority of the attacks he would do in his second phase. He also stops taking damage at 1 HP and remains un-defeatable. My question is, has anyone else encountered this yet?

Thanks (Video link is below)