[There is a slow, questioning eyebrow being raised as Robin elaborates his encounter at the ball.]

Yes, I would say they respond just fine to a gentle touch. Most have seem surprised but not offended when I have turned down gifts. [His gaze flickers up, for some sign of why it's getting darker. An overhead cloud, maybe?] The barriers must be necessary for their survival. Only their wizards would be able to erect them, wouldn't they?