The world-class players are so powerful. I recorded myself once and watching the replay was agonizing. Because I didn't expect to see myself so slow compared to these athletes.
ja, ist er das wirklich? Und was ver komische Rückhand-Konter-Schläge macht er da auf der Vorhand-Seite? Er dreht den Schläger beim Vorhand-Konter/Block auf die Rückhandseite...
This is the first time I seen Ma Long reverted back to his normal form. Kind of makes sense not to waste energy staying transformed for too long just for practice. Although, kind of unfair for FZD to stay in his super form till the end.
It helps the breathing. Actually, the screaming it not intentional it's just a consequence. The liberation of air during a great effort makes this sound. Ofc u can do it without "screaming", but doing this improve your resistance. Btw, this is very common in world of sport. Take a look in tennis matchs.