Just did a run of Dalaran with a random anomaly, and noticed the AI breaking and hitting each other. At first, I thought it was going to start reflecting my own attacks too, but no, the enemy just randomly attacks itself whenever the effect triggers. The Units can even LITERALLY attack themselves, disappearing from the battlefield with a loud ‘thud’ and showing up in the Action Bar as having ‘instakilled’ themselves, like this newly-spawned Zilliax with Divine Shield somehow bypassing it to kill itself and STILL award the enemy hero the lifesteal-healing effect.
I don’t know WHY it’s using the ‘chance to attack the wrong enemy’ effect from the player’s side of the board, but it’s one of the best worst things I’ve ever seen.