There was a long pause before Ginny could finish. "After we were released, Sierra Katherine had to go into the Hospital Wing. I stayed by her sickbed unless I was in class or there was a war council with Neville and Luna. But the first chance I got, I tracked down Greengrass in the halls and felled her with the meanest Bat Bogey Hex I've ever conjured." She smirked with self-satisfaction. "Laid her up for weeks. Even better, she wasn't in hospital when Sierra Katherine was, so at least I wasn't subjecting my little buddy to any more torture."