dammitbobby, when you successfully got the word "abrupt" added to the rule book, was this what you had in mind?
No - the reason I suggested the change was due to a situation where the defender 'rode' him for a while, then yanked him down and buckled him. I got talked off of the foul by the B (I was wing) because he didn't pull him down immediately upon engaging.
I do not think this (clip) is a foul; even though he grasps the nameplate area, he doesn't pull him backwards and buckle his knees; he actually falls forward, like a normal tackle, with the only difference being the location of the tackler's hands. I think if would be the same result if he had his hands outside the nameplate area on the sides, or grasped him anywhere else, really. The point of it being a foul is that it causes a dangerous condition for the runner; I don't think this action puts the runner's legs or knees in danger of injury.*
*No danger of injury from a HCT perspective, but do I think this is a good example of a hip drop tackle, which is prohibited in the NFL, where the defender uses freehanging bodyweight to bring the runner down. So while this tackle IMO has a higher chance of injury, it's not related to the HCT aspect of grasping him in the nameplate area.