Week 5: #9 Eastern Washington @ #11 UC Davis Launch — a player leaving his feet to attack an opponent by an upward and forward thrust of the body to make forcible contact in the head or neck area
A crouch followed by an upward and forward thrust to attack with forcible contact at the head or neck area, even though one or both feet are still on the ground
Leading with helmet, shoulder, forearm, fist, hand or elbow to attack with forcible contact at the head or neck area
Lowering the head before attacking by initiating forcible contact with the crown of the helmet
I originally thought the call was wrong, but I looked up the rule (above) and I believe he did lowered his head and initiated forcible contact with the crown of the helmet (last point above).