That is a huge amount of damage coming back my way.
Well 2 Stacks of poison so 200% fury so that may be causing the insane dmg.
the poisons are passive and she doesn't gain any fury buffs when she dashes back. this is an interesting interaction, and i think it's a bug. especially since the poison is ticking for a combined 400, so it shouldn't reflect back and kill him that easily
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