You really do not kick the ball to a teammate, you move it backwards with your feet on legs to the rear of the ruck, where the scrum half grabs the ball and passes out to a teammate. This starts a new phase of the attack. You have to enter a ruck from your side, or else it is a penalty. You cannot move the ball with your hands in the ruck or it a penalty to the other team.
well THAT explains it all! A++