I caught the game late but,
Tcu ran into the kicker, 5 yd penalty. Sdsu got a first down.
Apparently the sdsu kicker kept his leg up for an extended time, supposed to be about 0.4 seconds but it was clearly leg extended for 0.5 seconds, perhaps 3/1000s more, and a tcu blocker just happened to be blocked underneath the leg of the kicker.
Then, taking advantage of the known bias against tcu, the kicker lowered his leg on purpose and barely grazed the shoulder pads od the tcu player, thus causing the kicker to appear as though he had been attacked by the tcu player.
Amazingly, it was several seconds after this feigned collision that the ref threw the flag. More amazing, the refs opted to call just running into rather than roughing.