Snape relaxed, and stopped writing. "You will not be allowed to leave the castle," he told her, "Even on the grounds, you must be accompanied by a chaperone." He leaned forward, and his voice dropped to hardly above a murmur. "The terms of this arrangement are rigid. We will be under constant surveillance. You may be required to present yourself before the Dark Lord. I will not be able to openly help you in any way. Am I  clear, Miss Granger?" 