Oklahoma quarterback Jackson Arnold burned his redshirt when he replaced a struggling Michael Hawkins Jr. in the first quarter against South Carolina on Saturday.Arnold’s fifth appearance this season means the former five-star prospect is no longer able to take a redshirt this season and is left with two years of eligibility after the 2024 season, according to NCAA rules.Arnold, a sophomore, completed 61 of 102 passes for 538 yards, seven touchdowns and three interceptions in the first four games of the season, leading the Sooners to an early 3-1 record. He also rushed for 138 yards and a pair of scores.Arnold last saw action on Sept. 21, when he was benched during a 25-15 home loss to then-No. 6 Tennessee after he hit on just 7 of 16 passes for 54 yards and an interception. Hawkins took over, throwing for 132 yards and a TD on 11-of-18 passing, and was named the starting quarterback for Saturday’s game.However, the freshman was pulled for Arnold after committing turnovers in each of Oklahoma’s first three possessions against the Gamecocks.