Immortal Berserkers

[BraGroDum]

Hello, I don't usually post on game boards, but the scale of OpenMW is so impressive, I thought to ask a question.

GOG version
Win10 64 bit

I put a whole load of mods on via Vortex, and after disabling the Face pack compilation (which appeared to cause massive ! marks) it actually runs.
I found my way to a 'Mead hall' full of rowdy Norsemen, all very well, but now am being pursued by butt naked anatomically correct Berserkers, that are it seems, unkillable. The Berserkers outside the Castle start up area do die though.
I don't think they are supposed to be immortal, so I guess this is some kind of bug.

Is there a known solution?