Yes the game is changing, but, it's necessary. Hard to tell with certainty, but, it looked like the runner was far enough downfield that the block , or, lackthereof, wouldn't have even impacted the play. So you have a player that sees an opportunity to lay a big hit on the opposition. I don't blame a teenager for taking advantage of the opportunity because I would have done the same thing at that age. BUT, this is where the education needs to begin in order to change the game for the right reasons. It's a great game, and, anything that can be done to limit serious, or long term injuries will make it better.