I was really impressed with Embiid's ability to stay with Tatum. People need to remember that these videos are edited, and Embiid was sticking with Tatum even on the shots that made it to film. That said, Tatum is such a great scorer. His ability to get his shot off against length is remarkable.
Semi...you can see why his shot is so mechanical. Hanlen was even shown correcting his hand placement. When people start messing with your shot too much, not only does your shot start becoming unnatural, but it starts making you think to more about form when your concentration should be on the basket. Again, now I see why Semi looks so stiff and mechanical shooting the ball.