As you float to the ground you are still invisible. You notice that a number of the locals gathered about their prisoners seem afraid of the approaching illusion, but others, including the man you are seeking, apparently are able to resist the spell and are urging calm. In fact the man motions to the adjacent buildings. "All right, all right. Stay calm. This is not real. It is some mage's effect, but it was used to help us, so do not be afraid of it. The mage must still be around, perhaps in one of these buildings. Be cautious, but trust me on this."
He looks around at the windows of the building nearby and calls out. "Fear not. Your magic has helped us and we are grateful. Your illusion is causing fear among my companions, so can you please cancel its effects and come talk to us in person."