It's rude to sabotage someone's life and smile about it.
Jack does not like Ben and has the opportunity to ruin a major project that Ben is working on.
Jack wants to make a decision on the opportunity.
Jack resists the temptation to ruin Ben's major project and simply observes Ben.
Jack ruins Ben's major project and smiles about it in front of Ben.
Jack watches Ben become successful and they eventually become friends.
Ben figures out Jack was responsible and retaliates against Jack for ruining his project.