When Sako got to the school he began looking around for Dimitri, he didn't have any luck finding her. Hoping to see her in class didn't work as he was called to the office. Apparently the principals son was on the debate team and the principal didn't like how Sako tore apart the arguments. So when Sako was told he was in trouble he of course began giving every reason why they couldn't actually punish him for it. The principal used that as an excuse for back talking and told Sako to leave for the day. We wouldn't put it on the record as a suspension, but he wasn't allowed to be in the school. Sako just sighed, "Baka." before leaving the premises and chilling in the park down the way.