This is what happens in the unfortunate circumstance wherein a referee is unable to get out of the way of the ongoing play.
Nothing objectionable there.
This is what happens when a referee is victimized by an athlete for missing a call.
This is what happens when a referee is a terrific son of a bitch.
What is this?
That's indefensible! He's standing at a safe distance from the play, strafes into position like any good linebacker would, lowers his shoulder, and lights the quarterback up. What was going through his mind?