Naomi yanked Castiel back up to her office. She had to keep him out of Heaven. It was part of her big plan. Nobody knew what that was. Some other angels had bits and pieces, but she was the only one with the whole plan.
"What am I supposed to do?" Castiel asked when informed he was to stay out of Heaven.
"What do you want to do?" Naomi asked. It didn't matter. She knew what he wanted to do and that was what he would do. He could do whatever he wanted for the next few weeks, though. With what she had in store for him, it was the least she could do.