"Second problem: You're underage, which means you've still got the Trace on you." Moody told Harry, who gave him a quizzical look. "The Trace is a charm that detects magical activity around Under-Seventeens, the way the Ministry finds out about underage magic! If you, or anyone around you, casts a spell to get you out of here, the ministry will know about it and so will the Death Eaters. It's the reason why Mattheo will be partnered with Artemas because he can't do magic yet, he's underage, and it's why Alani had been using physical violence out of school, not magic." Moody exclaimed. 