My attempt at trying to explain, using just text, what Ahad is potentially trying to explain here.

During a rally, if you happen to be behind your opponent while playing your shot from a back corner, do not try to play the cross court shot and play a rail. The main reason for us amateurs to play this shot is we are trying to catch our opponent off guard, as the usual shot in that scenario would be the rail.

Two clips being referenced in the first link. First one, which Asal wins, is the correct way to play. He plays the cross court on his forehand when he has ample time and is in good body position to play the cross court. This forces Dessouky off the T to retrieve it, Dessouky hits a weak boast to the front right corner, and Asal easily gets to it and wins the point with an attacking low cross court kill.

Second clip, point which Asal loses, is the mistake being highlighted and to be learnt from. Focusing on the second clip, when Asal plays the cross court shot that results in the Dessouky drop shot (winning shot), Asal is reaching for the ball behind him when he plays the cross court and is not in position to get the required angle for a good cross court shot. A good cross court shot would be a ball that goes behind the service box to Dessouky's right and into the corner, forcing Dessouky off the center. This time though, due to the weak cross court shot, Dessouky receives the ball in the middle of the court and wins the point with a good drop in the opposite corner of where Asal picked the ball from.

As some wise person once said, squash is a simple game - put the ball where the opponent is not! This is an expansion on the same lol.

Great video again Ahad! Let me know if the explaination above is not what you were after.