"Yes," Dean answered. "You have to smash their heads. Bash the brains. And if you get bit, you better find someone to take care of it or you'll become one of them." He left off the threat that he'd be there to bash her head in if that happened. He didn't much care who or what a zombie once was, he would kill them all if he could.
"You think you can handle a gun?" He wasn't so sure. She seemed a bit skittish. But he couldn't very well leave her unprotected, and he wasn't about to adopt her. He'd saved her from the one zombie. After that, she was on her own.