It definitely is fine as is no need to nerf or change it.
It's your fault, you see him in his super twirling like a maniac then you dawnblade at the ground where he will walk or fly away. Stop making complaints after one encounter no one runs arcstrider like that to begin with.
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If you would read the comments another person has pointed out to me the mechanics of it and that it would be a bug.
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It is not a bug. I would deflect two Blade Barrages back at these hunters (back to back of course) consistently in rumble. Each attack it deflects comes back at you, with 2-3 hits it isn't enough to break that twirl but you die from spamming the attack in the same spot. It is not a bug and you will only stagger with arcstrider if you hit someone at the same time they hit you.
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According to what Smallershrub had already stated it has a high damage threshold so 2-3 dawnblades should make them flinch, one dawn blade swing is far more powerful than a blade barrages knives as the impact isnt lethal it is the explosions.