If a mob enchanted with thorns is hit with the Sponge Striker's third combo attack, the damage dealt to the player is multiplied by an insane amount, enough to kill a player in Renegade Armor with Potion Barrier. For some reason, the text at the bottom of the screen says 78M health in one screenshot. This was tested on default VII difficulty. On higher difficulties, the damage reaches even higher amounts, but I was unable to take a screenshot of those. I assume this has to do with the Sponge Striker's "Deals absorbed damage during attack combo".