D.U.S.T. to D.U.S.T. Mission Bug

[Apparition]

I'm pretty sure this is a bug...  At the end of Katie Douglas' mission D.U.S.T. to D.U.S.T., you face off with Praetorian Colonel Duray.  I defeated him, and he said, "Mission aborted! I'm 'porting out!"  He then teleported out, and the mission completed successfully.  But a few seconds later, Praetorian Colonel Duray teleported right back in.  This time, he was completely untargetable.  I kept receiving an "Invalid Target" error whenever I tried to attack him.  However, he sure could target me.

[AmbiguousOmen]

I had the same bug in the same mission. An untargetable Praetorian Colonel Duray showed up after the Mission Complete, he could pelt me and and minions with attacks but I got the "Invalid Target" error when I tried to attack him.