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 !

Same here, lost an overleveled sorc (lvl31) 865 hp 275 ES yesterday to him the same way.
First attack on starting animation, sliding sword, I was 100% out of the hit box for that but died instantly.
Seems to be bugged for sure.
Did some testing on him afterwards on SC with the same char and haven’t had this happening again.
Even went into the animation intentionally. But never did even close to that 1hit dmg again.

I would really like the devs to investigate on this. And give us some updates.