Harry, you've been a bad boy. Practicing magic- or trying to- in front of everyone? In front of Bro? That was a fucking mistake. Which is to say he was watching you. He almost couldn't really believe who he was looking at- either it was a ridiculous fanboy in cosplay, or it was the actual fucking Harry Potter. Considering where he was, he was inclined to believe it was the actual fucking Harry Potter he was staring at- and a depowered Harry Potter at that. Well that's fucking disappointing.

It looked like it was time for him to do a bit of trolling. Considering he's been out of sight this whole time, he stayed in hiding long enough to grab a piece of paper. He scribbles away for a few moments, before balling it up and tossing it at Harry's head. Before Harry could notice him, he ducked back around the corner.

The note, if Harry were to read it, will say

"Dear Mr. Potter,

youre going to azkaban motherfucker."