Anyone know how to get the hunters to drop into the ocean during battle of sunaion, trying to get Worms don’t surf achievement. looking for hints & tips

You just gotta get lucky by tricking them to fall off. Lure them near the edge and try and get them to charge at you. Dodge their attack and hope they fall off, make sure you don’t die along with it as you need to kill them both that way in the same encounter.