Rathbreaker bug

After engaging Rathbreaker, if you run down to the lower level it causes him to reset and regain his life (which seems intended)

But starting the fight again causes his entire script to break, he'll only follow the player and use auto attacks, while the archers on the ridge only shoot auto attacks and won't use their line AoE attack

I encountered the same issue with Rathbreaker twice now. Once in the campaign and the second time during maps.