If a player casts a spell like Lumos Maxima at air or water that was transfigured/transformed because of a spell another player cast, it could revert the block back to that type which, itself, may have already been reverted to its original type - thereby undoing the first spell's revert. Messy.
If a player casts a spell like Lumos Maxima at air or water that was transfigured/transformed because of a spell another player cast, it could revert the block back to that type which, itself, may have already been reverted to its original type - thereby undoing the first spell's revert. Messy.