I have reported this before on Steam forums. Basically this:
What I’ve received:
“I’m sure we’ve had this before but were never able to reproduce it! Thank you for the video, it’s helpful”.
I don’t know if it’s useful to bring it up again, but I’ve encountered it again. No video this time, unfortunately.
But I am positive it has something to do with Ironbreaker. This time I could pinpoint exactly when it happened: Ironbreaker was on death’s door, died to a nomming grab of Chaos Spawn before it could even chew on him. Not long before he had his Gromril Armor taken off, it had the knockback Talent.
Other than that I don’t know their Talents/loadout apart from Drakegun/Axe & Shield.