He doesn't want to leave.

If she sounded desperate he could dismiss it as neediness that leads to poor judgment of his character. But she doesn't. She sounds like his Master making a decision he can't make for himself.

So it strikes him that he'd like to stay. He thinks that it would be good to fight again at her side while she looks as beautiful as she did back there--

"No. I think I'm having a rare spell of obedience tonight."