Excellent first post.
Another thing no one has mentioned, and this could be a "Physics of Football" segment, is how intentionally landing on with the middle and heel of his foot lessened the impact. Football cleats have several spikes up front and if he landed on the guy spike first, it would have put an extraordinary amount of pressure (300 pounds in an area less than a square centimeter) on that guy's belly. Dillon may have done that guy a favor when he landed the way he did and distributed that force over a much wider area. Sure, there are spikes on the back of the cleats, but more of them are going to make contact.