Sagan didn't seem very pleased with having to leave Kate. It was likely due to the trauma his head had gotten upon falling off the bed, but Sagan seemed to have grown rather dependant on Kate. Upon being told that Kate couldn't follow him any further, he started clutching his tiny hands onto her pocket, and sunk down so only his eyes were visible from the outside. Of course, he didn't want to be an inconvenience to her, and neither did he want her to feel guilty if anything were to happen to him. He looked up towards Kate, looking as if he was asking whether he really had to leave her. During the entire scene, Sagan's dizziness was slowly developping further, and his already blurry vision was being obscured by several black dots. It wasn't very visible, but Sagan was not in a very good condition.