Warden Eternal's sword box

I feel as if this is just me but I’ve noticed for a long while in firefight does it appear that the warden’s sword had a weird hit box where it doesn’t even touch you but yet you die? I know two of his attacks have splash damage but what about the upward slash he has? Does that have splash damage as well?

You mean this attack?

Nope but I’m aware of that attack never gonna try to ultra ghost him again cx it’s the upward slash where the sword sort of breaks into pieces but in a single line