Lately I've heard folks referencing the "Nightfeast" stuff in Grymforge, saying that Shadowheart approved of cannibalism?

Why was the feast cannibalism? I'm trying to remember, to think back, and for some reason, I was thinking it was a ceremony where the Sharrans had a big feast and then killed someone. Or vice versa, I'd have to go back to that particular scene.

But I don't remember anyone saying they were eating the person that got killed. Is that implied somehow? Did I miss something?

I just thought they had a big thanksgiving type dinner and killed some baddie selunites.