Ioan's knees struck the floor roughly, but he only grunted as he grabbed Constantine's shoulders. He didn't care if anyone walked in on them or that he was smearing blood all over the other's shirt. He wasn't thinking about simply hexing him. Taff had asked for it. No one messed with his guitar or his best friend. But, as he drew his fist back to hit Constantine, something stopped him. Perhaps it was the flash of fear he saw in those eyes, or maybe it was the fact that he was stuck straddling someone who was, after all, just a boy like him, on a dusty classroom floor. Regardless, this wasn't who he was. At least, before Azkaban. Since, he'd been feeling lost, alone, and a bit like a loose cannon. This was definitely on the loose cannon end of things, and Anthony would not approve. So, he gave Taff a rough shove under the guise of pushing himself back to his feet.
He glanced at his hand, wiped the remaining red off on his jeans, then cast an unreadable look back at Taff before retrieving his guitar once again. He'd repair it later.