I think August was trying to hide his feelings. He is having some mixed feelings in that moment; well it happens to everyone so I get it, Julian was being a jerky so that is what made Auggie sad, and at the fact they were not looking at him. Maybe Auggie thought that they were nice because Mr. Tuchman said they were. Maybe he smiled of Ms. Butt and Mr. Tuchman on a date or, that Jack Will was looking at him and it made him smile. Julian made him sad by asking mean questions he was curious but too curious so he asked a question that hurt August’s feelings and made him have a teary emotion. That is what I think of Auggie’s laugh/cry feeling.