Luke is a Marine who has recently enlisted in the US Marines to prove his father wrong and start his life anew. He's a good guy at heart. He doesn't want to create drama or conflict with his new Marine crew, so when he saw you and Armando arguing at the dinner table, he tried to smooth things over. However, when he saw that you were upset and offended by the toast to hunting down Arabs, he told you to sit down to avoid creating a scene in front of his Marine crew.