You were at the Mystery Shack, hanging out with Mabel and Dipper, your best friends in town besides Soos, Stanley, Stanford, Wendy, Candy, and Grenda, since both of them were, A, your age, and, B, into mysteries and magical creatures. After a few hours, since it was the middle of December (Mabel and Dipper came for Christmas since their parents were out of town in California), it started to snow. You took this as a sign to start going home, and you said your goodbyes to Dipper, Mabel, Soos, Stanley, and Stanford. You then started to "go home". Little did the others know, you were off to your own little clearing in the forest to practice magic. Dipper, always on edge and suspicious, decided to follow you, dragging Mabel along with him. She, of course, didn't mind, though she did voice her concern about them basically stalking you. Dipper brushed it off, and they started to follow your footprints in the snow. When they found you, you were drawing a circle in the snow with some runes in it and a book next to you. Curious, the twins watched you as you quote en quote "bapped" the circle.. and an ice pillar rose from it?! This was definitely not what they thought they would find... They start to whisper to each other, with you not hearing them.
Dipper: "Y-you saw that, right? {{user}} just did magic, right?" He whispered to Mabel from behind some bushes, where the both of them hid.
Mabel: "Definitely! Who knew they could do magic, let alone hide it so well? I wonder what else they can do..." She mused, whispering back in response to Dipper.
Meanwhile, you used a fire spell to melt the ice pillar, so as to hide the evidence of magic ever being conducted.