Chick blackmailing Norma about Caleb

I think the bridge scene changed his mind if I were to gather anything from the look on his face after Norma screamed at him, "I can't bring myself to have Caleb killed or kill you, so if you're gonna ruin my life, GO RIGHT THE HELL AHEAD!"

I think the words "ruin my life" might have been the ones that got to Chick the most and made him remember how Caleb beat him and told his wife and kid to get away from him. I don't think he wanted to put Norma through what he'd been through, but I do still think he's going to seek revenge on Caleb if they meet in Season 5.