The exception occurs when:
- I use the Murderer's "Charge" ability on an enemy
- The pushback should cause the enemy to collide with a second enemy
- The melee attack from the charge kills the first enemy.
I think the game is destroying the first enemy before attempting to resolve the collision. The second enemy is not stunned and no output messages from the collision are shown.
Also, if the first enemy does not die and the collision works normally, the collision message refers to "The the collision" instead of "The collision".