It took heavy energy projection from Thor's hammer and Beta Ray Bill's to put down Kurse. Thor is the only one here with that kind of power; Namor and Thing will be distractions for a while before Kurse angrily swats them down. Even Namor getting him underwater wouldn't help, because Kurse doesn't have to breathe. Better dig up boulders full of iron down there, becuase the only other thing would be Thor teleporting him into the Sun.