It is dependent on how close you are when you heavy. Sometimes, a parry puts you a pixel too far for the second hit to connect, meaning you will get tagged with the Astral Evade degeneration. Same for both of them, sometimes it works fine for me, other times I get punished instead.
That is true and doesn't seem to be a bug just hit him after you parry. works all the time for me but my Drax is only a 3 star and has a class disadvantage.
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Drax's dash attack has 2 attacks in rapid succession so mordo dodges the first one but the 2nd one hits him and stops his degen from triggering.