"They're tough," Ellen says. "The mutagenic process tends to make what used to be ordinary human skin into a really tough, really thick hide, and it's only thicker in the Behemoths. They'll eventually go down if you deal out enough damage to them, but most of the time they don't even notice pain until you've seriously threatened some body part's structural integrity. The mini-nukes hurt them with the explosion, but the radiation doesn't affect them at all. It's possible to kill one by snapping its spine, but you have to be something on the order of a super-powered Amazon warrior to do it, and even she had trouble with the one we fought in the Capitol Building."