Hahaahahaah!
Watching the game, had an earbud in one ear listening to Jeff and Phil but still had the TV volume on... a ISU-Red WR is using his left arm to hold off a bison DB. Phil Hansen said "That should be PI on the WR" on the same play LT was calling for a penalty on NDSU.
I don't think it should have been a penalty on either player, but if a WR has his arm at full extension holding a defender off, the defender should have the right to fight through that.
That said, what do I know? The refs has absolutely no interest in throwing flags... looked like they wanted that game over ASAP.