That particular scene is now up on the CN website–Panthro’s already gotten scarred on that eye.
Not to mention Grune hit him on the other side of his face from the Scared Eye.
I am also starting to think Panthro lost his tale in a battle. Perhaps in a future tale (pun intended) we will see Slithe sitting in his chambers/war room with either just Panthros tail nailed to the wall or perhaps a collection of them.. you know something really evil like that.