Bo clung to Luke's shirt as he always had done, even when a child, when he was upset. He wasn't crying because of Luke's decision, he was crying with relief that maybe now things could start getting back in some kind of order. He knew that for a long while Luke was still gonna need support, still gonna be fairly unstable in his thinking and his confidence...but he couldn't press down the feeling that it wouldn't be long once Luke was home that he would be able to see his older, protective, strong, kind older brother that he so missed.