The sergeant of the Zhentarim eyes the party suspiciously.

"Lend your aid, is it?" he drawls. He seems about to tell the group to get lost, but suddenly reconsiders. "I suppose the constable might have a word with you. He has a job that needs doing. We'll take you to the tower. But you'll be leaving your weapons at the entrance, and keeping your hands where I can see them."

The Zhentarim squad, perhaps wiser than their comrades in the forest, seem not to be taking your party lightly.