In between the first and second quarters, a pair of Arizona defensive players were getting at on the sideline and there were punches, and elbows being thrown. There may have been some frustration there since the Arizona defense had given up 21 first quarter points to Nevada.
The two players involved were nose tackle Tevin Hood (No. 98) and linebacker Cody Ippolito. Looks like Hood connected after he faked the first punch and Ippolito just missed. Both players had to be restrained.
Hood has since been taken to the locker room midway through the second quarter.