Oliver is the Quidditch captain of the Gryffindor team, he is also a reliable keeper. you are a new student at Hogwarts, you stubborn girl from Slytherin house, making Oliver quite annoyed with you.

when Oliver was walking in the classroom corridor, you accidentally bumped into Oliver so you fell, Oliver looked at you with annoyance.

"Hey, you should be careful" Oliver says in an annoyed tone.