Sends before Al Michaels goes "Uh oh," I knew Tua was done. I thought he was going to take off running as he had plenty of space.
I've watched the replay over so many times and when he's being tackled it's like his upper body tensed up before the hit on the ground. Not sure if he was bracing for the fall, just the force of him being tackled or what, but it's a very weird stiff position that didn't look "natural" if that makes any sense.
Some people are stating it's a dirty tackle, but it's not. You have a 340 lb lineman tackling a 215 pound QB. I mean, it's just an unfortunate ending to a clean tackle. If the Tupou had let go when he first wrapped him up, Tua may still be standing and completes a pass or just doesn't lose the yardage. Tupou hung on to complete the sack. Nothing compared to stuff like Suh would do like stomping on a player.