Because he didn't actually grab the facemask. He hits it on the way to grabbing his shoulder. The rule is you have to grab it and then either hold on or twist. That didn't happen. Several years ago, even incidental contact with the facemask was a penalty. That isn't true in the NFL anymore. I'm not surprised they made the call because it looks like a face mask in live speed action. It's an understandable call to be missed but it was missed. Unbelievable that they can't go to the replay for penalties like that. I understand not allowing regular holding calls to get reviewed, but a call like that, which isn't a judgement call at all, should be eligible for review. Also, I liked the old incidental facemask 5 yard penalty. The distinction is key IMO, but whatever. Yeah, the old 15 yarder required grabbing and twisting. Getting rid of the incidental just opened the door for more incidentals to be called 15. And you put your hand on the QBs helmet/facemask at any time and you can expect a call.