Flynn had known that Duke Ceylan would appear after Markel's defeat. What he had not expected was for the Duke to personally deliver the final blow to his own son.
Technically, Prince Markel had already reached zero health. The fight itself was finished. But the game's script demanded a lingering moment before the scene could conclude. Markel remained alive just long enough for the Duke, concealed within that towering pillar of black light, to emerge, deliver a lengthy speech, and then carry out the execution himself.
