He would have very much objected to the thought of damage for his shadows. (They are ALL his shadows as far as he's concerned.)

"You managed a little twitch already, that's good. Like anything, it just takes practice and the right mindset. You'll learn to notice which shadows happen with which kinds of lights and which color, and whenever you have time to focus, try to move them a little. Sometimes it helps if you ask for their help." A little corny, he knows, but polite and effective.