"Yes, but Tracey isn't Mother. She doesn't hex people; she's actually ... nice, quite disconcerting at times," Draco confessed. "I doubt she'll be hexing anyone, however there shall be no need for hexing. I've tested the potion. It renders the deliver completely pain-free."
Draco knew that they were talking about nonsense, because they couldn't talk about the important things. No matter how much he wanted to, trying to convince his father to switch sides was useless.