Title says it all, the Power's backlash damage or Disarm fails to trigger on any physical attack performed by multiple different enemies such as the Marked Mercs, Grettel, or the Manticore.
Played on the public version with Firefox.
Playing on the newest backer build[0.3.1] and can confirm that this is still a thing. Karmic retribution does not trigger no matter who you cast it on or who hits the person that has it on them.