In the Yin Yang subdungeon, if you get the timing right it's possible to get in a loop where you can keep killing one and then the other over and over, getting another +30 gold reward every time you kill one of them and opening the wall back up despite one of them having revived.
Like so.I should also note that the above ENDISWAL bug also occurs with walls that are revealed by LEMMISI but cannot yet be reached by the player.