"I would like you to report back but do it discretely and sensibly. There is no need to report back immediately," Rodolphus replied, knowing it would look odd if he did not ask for a report. The spell would work, he knew that, it had been tested extensively. "And do remember to cast several spells after casting the one you have just learned."
Once again he gave no explanations and by this stage he expected no questions. Miles should realise the need for covering his tracks... at least he hoped he did. "That is all," he said with a wave of his hand in dismissal.