This summer, I went to your home and cast all the possible angelic wards. The restriction of underage magic doesn't detect my magic. I had to make sure you're safe! I cast a spell on you, it lets me know when you're hurt and where you are so I can help you if necessary. But I forgot it would be a two way spell. I'm so so sorry Hermione. Please forgive me. But I knew what was coming and I needed a way to find you, should you be hurt badly. " 