All my snakes don't like being bothered when in shed. Remember that they're heat pits are also having a layer of skin coming off of them as well, so they're barely able to see, and their ability to pick up heat is blurred as well, the only sense that remains keen is their ability to pick up smells, and just because you can smell something and it is safe doesn't make this slightly lower than normal temperature shadow moving around you is actually safe.