If any player is grabbed by the “grasping vines” the boss follows with “consume” where it eats the player but for some reason after the cast has finished the boss dies randomly as if it took a large amount of damage. Doesn’t matter if it’s 1 player or even 5, same outcome.
Was tested multiple times with gear on and off, so the achievement with this boss “All Bark, All Bite” is unachievable atm.