Meg couldn't believe Dean was being so hard headed about this. Castiel needed to angel up. She needed a powerful ally. She had an idea of how to get Dean on her side. "Sam's in there," she said, indicating the demon surrounded hospital.
Dean glared at her. She knew he would. That was OK. He would know that she was just using Sam's predicament, but Dean would do whatever it took to save Sam. She could see it in his eyes. He was beat.
It didn't matter, though. Cas interrupted them and Dean knew the gig was up.