Final Quest

You walk to the other side of the arena, and a man with glazed eyes carrying a sword leaps out at you. The green dragon knocks him unconscious, and then prepares to kill him.
"Wait!" you shout.
"He tried to kill you!" the green dragon snaps. "If I don't kill him, he'll try to kill you again."
"Did you see his eyes?" you demand. "They were glazed over. I think that he either forgot who he was, or was being controlled.
The dragon lowers his head to the man, and noses him out of the way. "There you go," he grumbles.
"Thank you," you smile.
"What do we do now?" the green dragon asks.