Lord Zedd | Halo: Reach - Firefight "Schism" Cut Setting @Zeddikins | Uploaded 10 years ago | Updated 6 hours ago
"Covenant Schism" - "If enabled, the Covenant will fight among themselves!"
Just me playing a round with it enabled. Sucks it apparently got cut before becoming a real setting otherwise this video would be accompanying a download link for the gametype. If anything comes up in sily maybe I'll be sure to let you all know.
I've been searching for a way to enable this for a while, turns out the scripts are all set up for it so I was able to enable it that way.