Arthur's life in the days after was becoming less ideal by the day. The investigation has made the entire campus filled with tension, as a student dying was something rather uncommon.
A person, who he believed to be Arlo, started rumors about the campus about him being the main suspect in Trevor's murder. This has made him isolated by both his dorm and an enemy of the Nightfall dorm.
During his classes, Arthur was either targeted or isolated. Either way, he dealt with it using his restraints or by acting indifferent.
He was still being monitored, so he had no way of meeting with Sarah or Miko. He might be able to arrange an inconspicuous meeting with Sarah, but Miko was an assassin. If anyone links him to that organization, he wouldn't be a suspect but a culprit.