This is an excellent camera angle to observe the so called follow-through or after-swing. Mostly coaches tell you to continue to draw your line with the racket and finish your swing high in front of you. If you watch Karim Darwish, you'll notice that he is rather doing the opposite : he cuts his follow-through and ends it short and low (except at 0:12 where he is looking to hit a hard straight backhand drive off a lowish ball from the back). To me this short and low version makes sense: most of the times your opponent will be near around you (without creating a 'Stroke' situation) and if you are able to reduce both your back- and after-swing, then you'll be able to prepare your shots rightly in many situations where players with higher/bigger swings will struggle.
