Hermione went white, chalk-white, nearly as white as Luna; but she didn't scream or stagger or go catatonic. She only made her way back to Neville as Draco made his announcement.
"I think we ought to go home," she told him, half an ear on Draco. "Warn Laura, send word to your people through the journals. I'll go outside and send a Patronus to Minerva and Remus; you help shoo people out, since they'll listen to you, and meet me there."
She kissed Neville's cheek with cold lips. "I love you." Her blue skirt fluttered erratically about her legs as she hurried off.