For example, it may have been near the start of the game, and the SD QB handed off to their runner. He made it passed the line and a couple of yards into open territory, and the Defensive guy, not sure who, was a few yards ahead, and took a horrible angle to the runner. It wasn't that the runner did some kind of head fake/body fake, it is that the defensive guy was about a foot off the target, like he had double vision and chose the wrong image to tackle.