He exhaled a soft breath when she made the vow. "I swear to you and on my magic that everything we say is the truth to the best of our knowledge," he said, feeling the vow take hold. It may be a bit extreme but he wanted her to know how serious they were. He picked up his wand and said a simple lumos, causing the tip of his wand to light up brightly. He said the counter spell before pocketing his wand again.

"So who could she have sacrificed... I assume Bill and Charlie are still alive. We know the twins are here and Ronald. Percy... I haven't seen or come across him yet, have you," he asked Hermione with a raised eyebrow before turning to look at Professor McGonagall. "He'd be Prefect this year or next." He doubted she'd have sacrificed Ginny or Arthur.