By the time they remember the Carrows, it's too late.
The two of them are still restrained and virtually unrecognizable, faces bloodied beyond all recognition.
Amycus Carrow's attack was particularly vicious. His head is smashed in, his brains spread across the blue rug of the Ravenclaw common room in a macabre tribute to the brains that 'set Ravenclaws apart'.
Whoever did it never comes forward to claim their glory.