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They're some of the freelance NPCs that may or may not fight in Campaign. Whenever Ulla, the girl, dies, Kilhwch goes insane if he's not killed fast enough. He usually says in chat "How dare you!" when this happens.
This was the first time I came across him actually.
It was during a rather icky Pashhow Marshmallowlands where I'd pulled more mobs than expected. These two NPCs were fighting nearby when the MegaBoss Quadav rather randomly, atleast from my POV, killed Ulla with an Ore Lob of whatever that TP move is called. This caused Kilhwch to spam Nights of the Round amongst a rather laggy group of Quadavs, including that annoying BST NM that spams Petrify. He died quickly thanks to Petri but not before killing a few quadavs that were also pounding on me.
I got all caught up in the moment and went I SHALL AVENGE MY FALLEN BEARDED BRETHREN, before realising he'd just MPK'd me and was about to die rather quickly.
I miss campaign.
Edit:
@ Spence
Yeah, it felt odd not drawing me with a Cap too lol.