"Thanks." For the luck in part, but mostly he's deeply grateful for the chance to do something.

He half-smiles. What Roland spilled about his relationship with Alain was confusing, but it seems there's no cause to doubt that Alain is a good guy. "Not too deep, I don't think. It was givin' him some trouble when he walks, but I'm gonna bet you know that that's not the kinda thing to keep him down."