Will's face was still smarting after Micah decided to be a dick and introduce his fist into the equation. Sure, he put up a fight but in reality if Rick hadn't stepped in, he probably would have been bludgeoned to death. Which in his mind wasn't a bad way to go so he made a mental note of it.
Seething at Micah for starting and not finishing the job, Will waited while he finally read his words, remaining silent at the realization of who the brave fool left behind. In a twisted way they had something in common. He chose to resent him for that.
Now it was his turn. Opening the page to his crime, he snorted. Somehow the book reprieved him of the blame for his brother's death and instead admonished him for causing a girl to cry. It didn't take a genius to know who the book was mentioning. Fine, what the fuck ever. "I made Beauty cry by cheating on her and making sure she walked in on us," he snarled, daring any of them to press him for more information. "There, it's done."