In American football, a chop block is an illegal block that is different from a cut block, which is legal in certain situations:
Chop block An offensive player attempts to block a defensive player while another offensive player is already engaged with the defender. This is considered illegal and penalized with a loss of 15 yards because it can injure the defender.
Cut block An offensive player blocks a defensive player by targeting the player's knees. This is legal when the defender is not already engaged with another player. However, some consider this block to be "dirty".
The NFL and Fall Experimental Football League have banned the chop block, but the cut block is still legal in the NFL. In the NCAA, cut blocking is allowed as long as the block is away from the ball's original position.
After watching the film, PWoo wasn't engaged by another player, so it was not a chop block (illegal), it was a legal cut block. Had PWoo been engaged by another blocker, and the guy did that, it would have been illegal.
You can question the necessity of said block, and I pray PWoo is not injured, but it appears to be a legal block.
I think there is a new rule regarding cut blocks that they can only be performed straight ahead and not at an angle. That was the explaination last week in Mafahs penalty.
From what I read, inside the tackle box is legal below the waist (a cut block), but it is illegal outside the tackle box. I did read one article that stated only lineman can do a cut block, and the App State player that hit PWoo was 87, so I imagine he was a TE lined up to the right and was pulling left to clean up any pursuit from behind.
He did go at PWoo head on, but Dabo did say he was submitting it to the league and he knows the rules better than I do. It looked ugly, it looked unnecessary, but it was within the tackle box and he wasn't engaged by another player.
All that being said, I just hope he is not injured and is at 100% for NC State.