Since learning that the werewolf on the staff was not, in fact, Adam fucking Lazzara, Gabe had been biding his time. It might be a fundamental Slytherin tenet that vengeance was a dish best served cold, well-stewed, salted with vindictiveness and garnished with certain domination, but actually Gabe had mostly been holding back due to being stupidly busy. But also, he was waiting for the next Wednesday, when both he and his victim Lazzara had a free period, because the beautiful thing about that was that if they were free, almost everyone else would be busy and not, ergo, interfering.
And so this Wednesday found him heading straight for Adam's door. He'd left his robes in the basement, since jeans and shirt didn't impede full freedom of movement like silly billowy sleeves did. He lifted a hand and knocked cheerfully - even jauntily - on the door... and then a moment later, tried the handle. Maybe Adam had been a little careless?