Law 15.6(d) just says what I have said. When the ball is in the tackle or near it you have to come through the gate. It says nothing about what you do when it leaves the tackle area because it doesn't have to. Normal laws apply. I.e. the ball has been passed (left the tackle area by not being on the floor) or been picked up. (Player in possession.) The laws says that the tackled player can do three things when tackled. Release the ball - ball still in tackle. Place the ball (on floor) - ball still in tackle unless has exceptionally long arms! Pass the ball - tackle over. If it goes to a supporting player - well done, play on. If it goes to a defending player - tough, play on.