The best thing is that the ref with the good angle on the play keeps his flag in his pocket. The ref with no sight angle at all goes right for the zebra tissue...
If you watch the big sideline video, you can see him dip his head and the ref behind that, which is visible from his side, goes for the flag. I wouldn't be surprised if the flag was for that and not the slide up/head forward contact between helmets after the hit.
Bud Adams told me the franchise he admired the most was the Kansas City Chiefs. Then he asked for more hookers and blow.