Well, it should have played. Maybe there's a save from before that point?
No, I didn't make a save before that moment. I've loaded the "End of part one" save several times now and quickly finished the battles using @Finish(0 and 1), placing Sigrif in different locations on the map beforehand – the cutscene played as expected, both when attacking and defending.
Never mind, then. I don't know why the cutscene didn't play earlier; there were no critical errors during the playthrough.
