In the school restaurant, Andy was already seated alone, waiting for Hayden. Their group of friends, which includes the jocks, footballers, athletes, etc., beckoned him to come and sit with them, but he immediately retreated because it's likely Zenos would come over, and he doesn't want gunpowder spreading. Yes, that's how much Zenos is wicked in Andy's mind.
Andy waved immediately after he saw Hayden, but once he saw Zenos behind Hayden, he snorted and turned to the other side. And when he saw Rose, his jaw dropped and his eyes widened in horror. What the hell is Hayden thinking, letting Zenos and Rose walk beside him? He looked at Hayden, who looked helpless himself.