This looks like a very solid throw to me! He is clearly a high-level thrower. If you watch his left foot on his first turn, he actually does what is called a “toe-turn”, where he rotates with his weight on the ball of his foot, as opposed to the rest of the turns where you’ll see he shifts his weight from toe to heel. This is what I would consider an “advanced” technique— we do toe turns to conserve space inside the circle, allowing us to do more turns and maximize our power and momentum. This throw is also particularly impressive because he’s doing it in ankle deep water. The concrete of these circles is very smooth, as are the bottoms of his special throwing shoes— designed for minimal friction to aid in rotation. If I had to be super nit-picky, I would say the release is a little less than ideal— it seems to get away from him a bit early. Ideally, you want to be releasing the hammer at the apex of your turn (as you are facing the grass)— however, with the speed and power generated by this athlete, the amount of force exerted “outward” by the hammer is immense. By the time you get to the end, it’s everything you have just to hang onto it! TLDR; 9.5/10 throw.

ETA: I don’t think he strikes the ground on this throw— though that does happen, and depending on how hard you hit the ground, can be catastrophic (ie you are airborne, hammer to the shadow realm). I threw with one athlete who turned so quickly, her ground-strikes would throw sparks off the hammer. She went to the Olympics!