"Yup, that's me," the Doctor says.

This was stupid. This was stupid and rash. He should never have run onto the sword, he should never have started fighting with him in the first place. But they needed this, they needed the distraction. They needed to fight.

"We always needed to fight," he says. "Maybe if I'm gone you won't have to."

He's being a good self-sacrificing martyr.