tu different tackles him and helmet hits him square in the facemask (ASU was barely turning his head upfield). Knocks the dude on his ass and it almost looked like a concussion.
Officiating expert comes on and says it looks like it checks the boxes. And then the replay official gets the memo from his master and rules in favor of sips.
ETA: for all the ticky tack calls made this year, this one was 100% obvious with 10 camera angles confirming it.