I think the glitch had something to do with the wall rush made by the Jecht shot...
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Mains: Cloud Strife, Zidane Tribal, Sephiroth, Warrior of Light
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More info I've realised, With Shantotto and you link a HP spell, AFTER the HP hit, into a Fire, It sort of looks like the glitch, because it tries to hit the opponent, but the HP damage was already done, Hard to explain, I know lol :3.