Cheap shot worthy of a flag? Yes. Dirty play? Yeah, if he's head or knee hunting, which wasnt the case here. Honestly, getting hit in the stomach/chest area and getting that hurt from it seems kind of like a fluke. When i saw it live, i thought he just got the wind knocked out of him from a cheap shot.
If you think that was a dirty play, then Kenny Bell's hit on that Wisconsin player would be a dirty play. Which it was not. Cheap, yeah. But keep your head on a swivel young man.