How many people are in a lesson? How big is the space? If there isn't much room for you guys, it sounds the exact opposite of safe... I mean, not even enough room to circle? NOT SAFE. What if one horse spooked?
Holy crow I'm riled up about this one! I've never heard of such ... you know what. I would move stables, that one sounds... special... No offence meant, but it doesn't sound safe.