Look at how he lands a body shot before he rolled over. That was pretty quick. Any one see the punch?
Like the move :good There actually is a better method to get behind your opponent than this one what I actually have never seen in a boxing match, but was often used in Karate during the late 80's and early 90's. Until noone fell for it anymore and countered it with a full force Ushiro Geri (kick backwards). I don't know if it's actually legal in boxing because it concists of swiftly turning your back towards your opponents side while turning behind him. But it's actually strange I've seen nobody do or try it even once, in so many fights.
The body punch with his left is quite obvious. The right hand one is not unless you run the video in slow mo. You will not see these punches when watching live.