GEEZE, one of my vampire companions snapped and went berserk with no warning. As I was coming out of a keep area, I saw that one of my companions was flashing the red exclaimation mark, but I didn't see the message and I thought he was just enraged and not berserk.
I'll let the gamelog speak for itself:
You: How are you feeling right now?
Ilum Izrolsas, Human Elite Crossbowman vampire: I cannot stand the world any longer...
You: How's life here?
Ilum Izrolsas, Human Elite Crossbowman vampire: Well, let's see... we've got the beast and bandits.
You: How are you feeling right now?
Ilum Izrolsas, Human Elite Crossbowman vampire: I'm feel like I'm about to snap.
Tedaz Alaisha, Human Axeman (to Belom Lundauthret Osaquazo Emsi, Human Axe Lord): Hello Belom. Praise be to Tura Grizzlyfamous. It really is a pleasure to speak with you again.
Belom Lundauthret Osaquazo Emsi, Human Axe Lord (to Tedaz Alaisha, Human Axeman): Hey. It is good to see you. It really is a pleasure to speak with you again.
Ozi Uquuroquoh Mizbo¤imma Kamca, Human Mace Lord (to Ejas Se¤idquab Thrathnu Dirlu, Elf Hammer Lord): Hey Ejas. It really is a pleasure to speak with you again.
*sound of a tight string snapping*
The Human Mace Lord blocks The flying +®+silver bolt+¯+ with the ®*copper shield*¯!
Ozi Uquuroquoh Mizbo¤imma Kamca, Human Mace Lord: I have a part in this. There is no need to feel vengeful.
Initially, the fight was using fists, but it quickly escalated to weapons. I added the sound for dramatic effect.
Would be nice to see more warning signs or something or even the reason why a companion goes nuts.