The grim line turns up the corners of Michael's lips until it's nearly a smile and he reaches out to clap William on the shoulder.

"You ever known me to leave a job half done? You need me, I'm there brother."

It's a sentiment he's lax to use in front of Jack, but it's the truth, William's a good kid - a good man - and he'd follow him to Hell and back if need be. Not enough good people in any world.