Dean crossed his arms over his chest and stayed quiet. If Molly wanted to get annoyed, he wasn't going to stop her. He'd just stand there.
What was he supposed to do, anyway? When Dean was the voice of reason in an equation, you had trouble.
"Okay," was all he said. Okay, she was Harry's apprentice. He wasn't doubting her, but he didn't know her. AT ALL. And she said the words black magic. He didn't like the idea of this, but they needed to know what was going on.