Ommun was a young Fremen from the Red Wall Sietch. With Stilgar and Turok they were harassed by six Harkonnen bravos. When Stilgar was downed, Pardot Kynes who passed near, intervened, giving them the opportunity to retribute.
When the Harkonnens were killed, Ommun took Kynes' groundcar and loaded Stilgar on it and went to their sietch. Later he narrated this to naib Heinar, speaking in favor for the Imperial stranger who saved their lives.