            "It means, Miss Granger—Mr. Black," he said, nodding at Sirius, "that his magic is not only powerful, but highly unstable. More so than any child intended to be tested. I suspect that only the slightest provocation would render him a danger not only to this trace, but to himself as well. And whoever remains in his presence," he warned, turning to Hermione. "Magic like this needs to be released as quickly as possible, lest it fester and grow even more precarious. Ordinarily, I would suggest performing spellwork in a controlled environment, but seeing as Mr. Black has a trace, we are left without many options."