When Ares fired sunder, He suicided. There was still one other enemy on the board and the Sunder tile CD tiled never changed.
I took screen shots if that is actually important to someone
I just encountered this, too. The countdown tile doesn’t, well, count down but it is on the board and stays there even though Ares KO’d himself.
Also saw this yesterday in PVE, Ares sundered and I killed him (he didn’t suicide) - tile remained.
Happened long ago over and over, looks like that bug has returned.
I was able to reproduce this bug reliably- his countdown tile from his Sunder appears to be up to its old antics. It persists past his demise.