As far as I remember, after Godric hides in the corner, there's a cutscene showing Nicholas arriving to help. He appears as a hero near the Fortress, and Agrael should appear near the Inferno. They fight, and there's another cutscene, and then the mission ends.
P.S. I played this mission in the demo, a pirated version, and the licensed version 1.0. I didn't have any problems.
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