TCU sophomore defensive end Devonte Fields saw his first playing time of the season Saturday against Southeastern Louisiana.The reigning Big 12 Defensive Player of the Year played only during the third quarter, seeing time in four Southeastern Louisiana drives and recording one tackle assist. Fields’ presence had much more of an impact on the field than it did the stat sheet, TCU coach Gary Patterson said.“That was our best quarter of defense,” he said. “More pass rush. I thought the team picked up as far as the defensive group.”In those four drives, Southeastern Louisiana turned the ball over on downs, had a pass intercepted by safety Chris Hackett and punted twice. On their previous two drives, going back to the first half, the Lions had scored. The quarter reprieve from Fields’ two-game suspension for an unspecified violation of team policy during the off-season gave him some game experience before TCU’s conference opener Thursday against Texas Tech in Lubbock.Patterson said Fields will serve the remaining quarter of the suspension later this season, but the exact time is still up in the air. “It was real good just to see him out there with the pressure we were going to get with him being out there,” TCU cornerback Jason Verrett said.Fresh facesSeveral young or new players saw their first action or made their first big collegiate play Saturday as Gary Patterson and his coaching staff worked deep into their depth charts.Making the most noticeable impact were Nebraska transfer Aaron Green and Wyoming transfer Josh Doctson, who scored their first touchdowns as Horned Frogs.Doctson, a Mansfield Legacy grad, scored in the third quarter on a 27-yard pass from quarterback Trevone Boykin. Doctson scored a touchdown against TCU when he was with Wyoming in 2011. Green scored on a 9-yard pass in the fourth quarter.Five players — Doctson, Green, Cameron Echols-Luper, Ja’Juan Story and Trevone Boykin — notched their first TCU receptions.Also, freshman linebacker Sammy Douglas from Arlington High recorded his first collegiate solo tackle in the fourth quarter. Running back B.J. Catalon, who saw significant time last year as a freshman, knows the importance of getting those milestones out of the way.“I think it’s good, definitely for a player’s confidence, because you feel like [you] can still do this even though it’s college and the next step up,” Catalon said. “[You] can go out and play with these guys and fit in just perfectly.”Banged upBeyond the injury to quarterback Casey Pachall were several other health concerns for TCU.Sophomore tight end Griffin Gilbert left the field limping and was on the sidelines in street clothes for the majority of the second half. Gary Patterson said he had yet to be briefed on the severity of Gilbert’s injury.Also, defensive tackle Chucky Hunter left the game in the first quarter with a leg injury but returned in the second half. He left the playing field after the game favoring his right leg.“He’s OK. Besides, he’s Chucky,” Patterson said, acknowledging the junior’s determination.