We need to think about several things, on a scrimmage kick there can be no blocking below the waist. Now, the offense is in a 3 point stance, if the defense runs into a down lineman, its going to be real hard for it not to be below the waist. A muffed snap and it becomes a running play so does blocking below the waist become legal? About The only way for a cut block to be done is by the up back to cut a rushing defender. Add to the problem you have is 4 officials, 2 under the goalpost, 1 on the sideline, and 1 deep behind and to the side of the kicker. I'm thinking what you saw is not as cut and dried as right or wrong.