The reason why the attack is trajecting upwards is because upon initial force of them launching the attack, it tilted Onigashima.
So when the Island straightened out, the blast is still following the trajectory it was on.
So when the Island straightened out, the blast is still following the trajectory it was on.
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Another supporting evidence for Zoro taking the entire attack is that his barrier is still showing after Hakai run through.
If Zoro wasn't there, why would his barrier haki be there?