While I really enjoy blowing up the little crew of Zhent traders at the goblin camp after killing the hobgoblin boss (and retaking my sold items) I kinda wish they didn't automatically turn hostile.. even if they're Zhents.
If you've met and aided the other Zhentarim group, it should be possible to persuade (or bribe) the halfling leader to rejoin with the other Zhents. Or to get the other Zhent leader to recall her. If you fail to persuade either her or the other leader, then you have to do a favor for the Zhents. Persuade at least five goblins to go to an isolated spot... where they'll get caught as slaves. Get a gold bonus for persuading the ogre in the goblin camp to come, too.
