After Arnold was done reading the memories that he was shown, he looked at Elena with a grim expression for quite a bit. As Elena was wondering what this man was planning to do, she noticed that his legs were shaking slightly.
Upon a closer observation, Elena noticed that Arnold was actually trying to get on his knees, but his body was trying to reject this action. That was why Arnold was standing still while his legs were shaking because it was getting two contradicting orders at the same time.
Seeing this, Elena threw him a bone and told him to relax. She also told him that he needed to take responsibility for the action of his students and make amends with their victims. Even though it was her who had defeated him, Elena was not directly affected by whatever his students were doing. So she was going to bring Armold to the real victims and they were going to discuss with him what they all should do next.
