AoA Heimdall Very Bugged

This is one bug (cancelling his heavy mid animation to block/turtle up after being hit with lights) but I've seen/heard of others - check clip from 0:26 onwards
https://www.youtube.com/watch?v=T1rWCLsgCn4

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It's a bugged AI. I completed all the objectives and in other instances he will not turtle in the same situation, even after autoblocking.