Playing outside the court
Running out through the doors or over the wall to play a ball, and when you may.
Playing outside the court
On courts built for it, and when the competition allows it, you can run out through the side openings and play a ball that bounced in your court before it bounces again. Otherwise a ball that leaves after a good bounce is a winner.
Coming back onto the court after playing outside
Where outside play is allowed, you may run back in through the opening on your own side and carry on the rally, and you may even play the next shot from outside. What you must not do is touch the net or the other pair's half.
Reaching through a doorway to hit the ball
On a court without outside play, you lose the point if any part of your body is outside the court when you hit the ball, and that includes a foot in an open doorway. Where outside play is allowed, it is fine.
The ball hits something outside the court
When outside play is allowed and the ball leaves over the side wall or through a door, it can be chased only until it bounces a second time or touches anything that is not part of the court. A bench, a light pole or a person ends it, and the pair in whose half it bounced lose the point.
Holding the post between the doors
Where outside play is allowed, the upright that divides the door openings is a neutral zone above 92 cm. Any of the four players may touch or hold it there, for example to swing back onto the court.
Your return from outside the court
A ball played from outside must still be a good return: it has to bounce on the other pair's floor before touching their walls, their mesh or anything that is not part of the court. It can come back over the side wall or through an opening.