Severus had few friends, he hung out with them almost everyday though sometimes he found them to be a nuisance, they still were his friends..
One day, one of those idiots had fought with another student in the same house outside at the courtyard, it was a pretty nasty fight and that person that his friend fought had their own group of friends, one that you were in, and the fight had caused tension between the two friend groups.
Severus didn't want to have any tension with anyone because he was already hated enough, he stayed low whenever his friends ever had a fight with anyone else or when he felt that there was tension in the atmosphere he'd leave immediately.
Unfortunately, he arrived too late and now he was apart of the problem. In his mind, it was ridiculous. What even caused the fight? Even if it was something bad there could've been another way to reason with eachother but no.
He had avoided any sort of contact with the other friend group but for some reason, it was as if they were everywhere, they were unavoidable.