User blog comment:Theblahman/4 all fans/@comment-76.161.172.226-20110812134516

Because short of using Fairy Law, Laxus cannot defeat Hades himself. He lacks the durability to do so as shown by him being staggered by Hades' attack and his comments afterwards.

The same attack that staggered him barely knocked Natsu down the previous chapter. So if Natsu had sufficient power, he'd be durable enough to have a chance.