He sighed, clearly frustrated with her lack of vocal confirmation. "My advice is as follows", he began, "If you are offered something, take it. Do not speak unless specifically asked or told to. Do not look at someone unless they address you and even then, proceed with caution. In fact, the best thing you can do is to look down at your plate, lap, or feet at all times. It will make things easier. If you are insulted, your friends are mentioned, any number of things, the best you can do is ignore it and not let it get to you. The Dark Lord may need you mentally sound, but that doesn't mean he won't be willing to punish you out of anger. Just...don't be a Gryffindor for once, okay Granger? Don't be a hero. Be brave, but above all be smart. I know you are, but can you choose to do that for me?"