Zalmarath one shot move, hitboxe

Hey Guys I hope my comment will reach a game developper or something, because it's very important for HC players.

Playing hardore with friends, keep getting one shot by his sliding sword move that doesnt even touch us.

Yes the boss is laggy and sometimes you can ''fall'' of the arena, but that doesnt hurt.

To explain the problem better look ;

I've lost 3 HC warrior with 1000HP, max resistances et 60% physical dmg reduced.
I have NO problems to tank him, BUT FROM TIME TO TIME, his sliding sword move hit me over 1K damage. I've done many testing with my SC char, the sliding sword move does like 50-100dmg, until you get unlucky and get one shoted.

And often he kills us from miles ways. I took a 3 sec Video but idk how to post it.

So my question to developper is ; IS IT WORKING AS INTEDED OR BUGGED?

Thanks and be carefull to that boss if you're on HC !

I feel your pain mate, investing so much to get one shoted by a bug :(

Here is my thread with explanations if you will to bump it

https://www.pathofexile.com/forum/view-thread/3624280