It took a few moments for things to click. "Oh." A few moments more. "Oh, bloody hell."
The problem was, there had been so many, he couldn't really recognize some faces straight away. He could tell who she was now, though. Something Jones, a Hufflepuff in his year. He and some other people had to escort her to the Carrows for punishment, and Greg had to reason with his friend Vince, who wanted to have some fun beforehand.
And apparently, "fun" was what the Carrows ended up having.
Greg's eyes doubled their side, his mouth open. This was what he had been fearing ever since arriving in this place: someone searching for retaliation. Unsure of what to do, he did what came more naturally to him: ask for the help of someone in charge.