There was nothing that he could do and they both had to have known it. Comforting her would bring forth unwanted territory, while walking out right now would leave them both feeling miserable, but content with the concept that they wouldn't have to endure vast moments of awkward silences after said comforting was completed. That was how he felt on his side of the water. Sam couldn't speak for Heather, nor could he think for her. That wasn't very fair at all.
"All right." He looked down, hesitating. He would probably look like an even bigger jerk than ever, walking out. Probably a good thing anyway. It was what he had wanted. To get Heather angry so that she'd learn to hate him. That way all of this would be easier. Dealing with an ex that you hated was so much easier than having your heart broken every time they came around.
"I'll see you later," he forced. And with that, he turned and strode for the door. No hesitation came when he pulled it open and ducked outside. He had to get out.