Karthus in Ascension (Gameplay)

Not completely sure if this is meant to go in this section, but since I am unsure if this was planned or not by you guys I thought I would leave it here (on the chance that it was not something you had intended). Karthus in Ascension seems a bit broken. If he dies and goes into his passive after killing the Xerath but before someone claims the ascended buff, the game still registers him as a character in the circle. This will prevent any enemies from claiming the buff. Furthermore, he can get the buff and resurrect himself out of the passive if he is the only one in the circle. This seems a bit broken since he cannot be hurt or moved out of the circle while in passive. So players are forced to stand in his aoes just to deny him from coming back as the ascended.