As a lawfag, I would have told my client if he feels like he is going to yawn to put his face into his arm like he is about to sneeze. Jurors are constantly watching you and making assumptions about you. They could be thinking. “Oh look, he is so bored with this whole thing and people died.” Now they would mostly likely think he is trying to be considerate of others by sneezing into his arm not spreading germs.