From Halopedia, the Halo wiki
On September 22, 2489 as Season of Plenty was preparing to jump to slipspace the ship's new AI Lorelei shut herself down for routine maintenance. Rather than rebooting the backup intelligence, Lieutenant Commander Nevel ordered Ensign Otto Seinmann to do the slipspace calculations by hand. Seinmann had Crewman Apprentice Preston Cole do most of the work for him instead.
Indara accused Seinmann of being cruel to Cole. She asked him why he was picking on Cole, who got his work done and didn't bother anyone. Seinmann replied, "He bothers me."