The Answer (Summary)

Over the previous posts, we have analysed the biomechanics of the handball jump shot. In order to score a goal, both maximal speed and accuracy are required.

To obtain the highest speed, the player follows a open-ended throw-like kinetic chain pattern with sufficient flexion in the hip to maximise the acceleration in all parts of kinetic chain.
Since Force = Mass x Acceleration, by maximising acceleration of the mass(ball), the greatest force occurs when the ball is released at the end of the kinetic chain. Handball players also attempt to eliminate the breaking impulse that occurs when running by throwing in mid air instead of planting their foot down and throwing. 

While in mid flight, handball players are getting closer to the goals, however, they have to throw the ball before their feet touch the ground (within the goal circle) with the greatest possible accuracy.
In order to maximise the duration of time a player's eye level is vertically stationary, the player must manipulate their center of mass by extending their torso at the last moment before the center of mass begins the descend.