Pretty much zero because Demon's on those Vulcans is a reduced special, meaning that "75% HP cut" for Demons would be "25% HP cut" for fleshies (and 15% for Androids in ultimate). Due to the reduction, a 1000HP enemy would go to 750HP, then 562HP, then 421HP, 316HP, 237HP... Whereas a single Demons Raygun special (not reduced) would take that 1000HP enemy down to 250HP in one hit.