Do you have the angle from behind the defense? That shows the "block" more clearly and you can see the blocker with his hands grabbing the pads of Balnd.
The rule states:
Use his hands or arms to materially restrict or alter the defender’s path or angle of pursuit. It is a foul regardless of whether the blocker’s hands are inside or outside the frame of the defender’s body. Material restrictions include but are not limited to:
- grabbing or tackling an opponent;
- hooking, jerking, twisting, or turning him; or
- pulling him to the ground.
I think the 2nd part describes what happened and it is right next to the tackle so it is hard to argue the hold was not material.
I am not going to make a federal case out of this. This one play did not matter Both teams were doing a lot of holding and little of it was called.