The shoulders are
comprised of the relatively large deltoid muscles, which have three heads — anterior, medial and posterior — and the
smaller rotator cuff muscle group, made up of the teres minor, infraspinatus, supraspinatus and subscapularis, which is responsible for supporting the ball and socket joint and assisting all overhead
movements.
By reducing either the
movement of crowds or just the numbers that
comprise them, they save money but at the cost of making their climactic scenes feel
smaller and more static than they should be.