Nemesis' alternate attack-hit animation

Been playing and enjoying nemesis so far but I cant really figure out what causes his other animation for hitting a survivor. Didn't find anyone else talking about this, is it just a random thing or does something in specific activate it?

Also, I've heard he has a different survivor carry animation too. I havent seen nemesis from a survivor POV yet, is it just his default carrying animation is different or does he have a different one that happens throughout the trial too, like his attack hit?

just wonderin

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