Sulik and Cassidy always flee when in combat

[Urizen]

I'm running FO2 with the Restoration mod, on xp. I'm level 24, with a full party. All of my other NPC's will attack and defend as usual when we're fighting, but Sulik and Cassidy just walk away to avoid combat, muttering cowardly phrases. It's like they think they're low on hitpoints or as if I'd have told them to be "abject coward"s, but it's none of those things. any ideas, people?

 

[Mr.Wolna]

Yeah, go to the doctor, cause this looks like they had a leg or soming else cripped!

 

[McRae]

I think it's always the same old problem. Your NPCs have broken limbs. Just cure them.

 

[Kanhef]

This should get stickied, given how many times it's been asked. At least four in recent memory.