It's good to stand up for people.
Adam sees Roger being picked on at school every day on his way from one class to the next, and sees the same thing happening today.
Adam needs to get to his next class.
Adam stops and intervenes on Roger's behalf for a moment, before continuing on to class.
Adam pretends not to notice as he walks by, hurrying on to his next class.
Roger is thankful that someone finally helped him out, and gains the self worth to deal with the people bullying him on his own.
Roger becomes suicidally depressed at the constant harassment he suffers.