The contrast between the contact laws in NFL and rugby are clear for all to see in that hit. Hitting a player that hard in the air would result in a red card in rugby union to protect player safety yet its also true that the NFL has been far more successful in adopting safer concussion protocols than union (although many players suffered before they did). The stop start nature of NFL does mean heavy contacts aren’t made worse by continuous exertion immediately afterwards even if the contacts themselves can be ferocious.