Manthing is probably out of Imhotep’s league at this point. Imhotep is an accomplished sand user and he can defend against many attacks by utilizing this ability. Unfortunately for Imhotep, Manthing has a lot of raw power and a single punch would deal heavy damage. Also, while Manthing is not as attuned to the elements as Swamp Thing; he has enough experience to know just where to go in order to win. Manthing wins.