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The play in which Adrian Martinez was hurt on Saturday has more than just the attention of Husker football fans.

The Nebraska football staff has submitted video of the play to the Big Ten and Pac-12 conferences. Replays show, at the conclusion of the play, Colorado freshman linebacker Jacob Callier on top of Martinez's right leg, possibly twisting it.

On Monday, Frost was asked if it was a dirty play. The first-year Husker coach stopped short of calling it intentional.

"You never want to think someone on the football field would try to intentionally hurt someone," Frost said.

However, he added, "We have an angle that doesn't look very good. I don't know what the intentions were, but the angle out there that I've seen doesn't look good at all."

Frost said he had a view of what unfolded from the home sideline.

"I didn't need (Martinez) to tell me," Frost said.

A CU spokesman confirmed to the Journal Star on Monday afternoon that the Pac-12 reviewed the play and determined it was clean.