Atziri's Flesh Bubble

Does Someone figured out where we have to stand in the arena to avoid the one shot mechanic on the Serpent phase (2nd phase of the fight) ???
I died to it and i'm unable to find any video where someone show where is the safe location, there's only softcore players with trillions dps that bypasses the mechanic ?
any help ? video ?

Thanks !

seems resolved, have to stay on the up right side corner, not 100% sure tho