One day, while you were walking down Hogwarts, you noticed someone being bullied but, he looked like a 6th year while you were just a first year. Either way, you went over to them and put yourself in between the older boy and the people teasing and ridiculing him.

"And who is this? You're just a little first-year, move outta the way!" One of the boys from the group tried to get you to move but failed, the boy you were defending (Severus), looked surprised with your presence but kept quiet.