Thralls that can't be killed

Game mode: [Online | Official server 1812
Problem: Bug
Bug location Scoundrels Gateway

last nite there were several thralls at this camp that could not be killed but which could kill you. Please fix

NPCs cannot be wounded while they stand under a tent. Lure them away from the tent to kill them.

I ran into this just now near the Black Galleon…several thralls that cannot be hit by a sword but could be knocked out with a truncheon.

They weren’t under tents.