When was the last time a player worked as a third-string running back in practice during the week, and on Saturday took the field as a team's starting quarterback?

Before Saturday, it had to have been awhile. TCU's Trevone Boykin made both unorthodox moves out of necessity, but couldn't lead TCU to a win over Iowa State in the Frogs' first Big 12 home game.

Boykin won the TCU backup quarterback job ahead of Matt Brown, but the 6-foot-2, 215-pound redshirt freshman from Mesquite, Texas, worked at running back with Waymon James out for the season with a knee injury and Matthew Tucker a game-time decision with an ankle injury.

On Thursday morning, TCU coach Gary Patterson dealt with the news that his starting quarterback, Casey Pachall, had been arrested on suspicion of DWI. Pachall was suspended indefinitely, and all of a sudden, it was Boykin's time.

For one practice, he was the team's starting quarterback. After Thursday, it was time to go head-to-head against the Big 12's No. 3 scoring defense.

"We wish we had a little bit more for [time for] it. The biggest thing is he doesn’t have the experience to do it," Patterson said. "Trevone runs better, but just needs the experience of seeing the field better."

TCU's offense didn't change much with Boykin in place instead of Pachall, but to make matters worse, Tucker couldn't play to provide Boykin a safety valve. When James went down with a knee injury, Patterson said he had one back he trusted. Now, that one back was down, and only freshman B.J. Catalon and senior Aundre Dean were left.

Still, TCU managed 455 yards of offense, more than any offense against Iowa State all season.

"You’re talking about playing your first Big 12 [game] and I consider Iowa State a pretty good defense," Patterson said. "The key is you can’t throw interceptions, especially not for touchdowns, and you can’t turn the ball over. He’s got to do a better job of managing the game."

Will Boykin get another chance this week against Baylor, which has had two weeks to prepare for the Frogs? Patterson says he'll address Pachall's status at his Tuesday media luncheon, after meeting with the school's AD and chancellor on Sunday.

Boykin was responsible for three interceptions, and Catalon coughed up a pair of fumbles, including one inside Iowa State's 5-yard line.

Boykin's last interception was returned for a score, but his speediness provides a new facet to TCU's offense that Pachall couldn't.

"We’re excited about it; he gave us some options we didn’t have before," Patterson said. "We’ll move forward with that."