[Shadow's getting better at interpreting Natsuno's microexpressions, at least]

Vengeance always feels so good, so viscerally satisfying. I'd be a hypocrite if I said that revenge is pointless. Sometimes that cruel happiness is worth the effort, but most of the time it isn't. Most of the time... it's best to just learn your lessons and move on from the past, let your success be the revenge.