Ohio State cornerback Bradley Roby delivered a high hit, and the Buckeyes' secondary took a huge hit as a result.
Roby was called for targeting after hitting Iowa tight end C.J. Fiedorowicz on a helmet-to-helmet hit, and though the crowd showered officials with boos, the call was confirmed upon review, resulting in an ejection for the All-American junior:
(GIF via ABC/ESPN)
It's a difficult call to make, because while Roby is clearly seen launching himself at Fiedorowicz's upper body, Fiedorowicz is 6'7", so trying to make contact with the Iowa TE where he was catching the ball would necessarily involve going high for Roby. Additionally, Roby is clearly not interested in wrapping up, but he leads with his shoulder; without helmets, the two players' heads likely wouldn't have made any contact.
But this is a sport with helmets and a newly vested interest in brain safety, so Roby's play necessitated an ejection, and he probably doesn't have much of a gripe after he injured Iowa RB Damon Bullock on an uncalled (and likely unintentional, but still obvious) helmet-to-helmet hit on the prior play. So it goes.