His Arrival + Her Return
It's hard to narrow down people into a box and categorize them neatly. People are bound to do things that might surprise you—and yet for peace of mind, it's easier to arrange them into little boxes and labels.
Oh, he's the quiet and loner one.
She's super bubbly and has that air of innocence around her.
And what about her? Why, she's quite mature and has that womanly grace and charm.
If a person happened to not fit into the category that several people prescribe themselves unto, then it was sometimes where one was bound to encounter trouble. Be it social rejection, becoming an outcast or simply standing out too much from the crowd.
And yet each one of them has their own breaking point, or an event where something that seems out of character occurs. As the group is not privy to the individual's thoughts and emotions, they may needlessly make trouble.