Seamus was nearly chewing on his tongue now in an effort to keep quiet or, well, relatively quiet. He wanted to counter Ambrose's flaunting of the IS with his own pride in the DA, but he knew he couldn't admit that he knew about it without endangering everything they were doing. And he wanted to respond to the other boy's comments about his friends and sharply retort about whose cause was really the lost one.
But he knew he couldn't.
And so he chose an easier, if no less satisfying, target. "Careful yourself there, Travers," he said, a menacing grin spreading across his face, "always so quick t'go for your wand. People might start t'think you're overcompensatin' for somethin'." He started to walk away from the other boy again, hoping to put this conflict behind him.