the world academy w headmaster be like
'serbia TRIED TO DROWN SOMEONE? HE'S ANTISOCIAL AND DANGEROUS WE CAN'T ALLOW HIM ON SCHOOL GROUNDS HE'LL HAVE TO BE HOMESCHOOLED JUST LIKE SWIT- wait what it was bulgaria? ah nvm this changes things a lot... I'd try drowning bulgaria too if I had the chance.'
(plot twist: eventually, due to pressure from the teachers, serbia ended up being homeschooled bc of what happened at the swimming club so that's why we don't see him in canon and why in canon only two swimming club members talk to the newspaper club)