It happened during a timeout Army's opening offensive drive of the second half. With Cincinnati holding a 10-7 lead, Army had just converted a 3rd-and-9 for a first down at the Cincinnati 42-yard line. As the Army players came towards the sideline for the timeout, Johnson found fullback coach Mike Viti and gave him a huge headbutt. Johnson was wearing a helmet. Viti was not.
Watch the video closely here, courtesy of ESPN. It happens on the right side of the video at the 1-second mark.
In addition to Viti being knocked silly, the headbutt by Johnson seemed to bring Army some negative karma. On the very next play after the timeout, Army turned the ball over on a fumble by Christian Anderson. Cincinnati took the ball and scored on their offensive drive, making the score 17-7. The 22nd-ranked Black Knights would never recover as 14th-ranked Cincinnati won the game 24-10.
Hopefully next time, Johnson can keep the physical contact to opposing players on the field.
[Fox News]