“Should it be pinned back with your lats?” Definitely not. As stated in the other responses, try to keep the bow arm shoulder in the same neutral position as it was before you started the draw. No pushing forward, no raising, no trying to squeeze an orange between the shoulder blades. As the shoulders rotate into the bow during expansion, it may feel as if the bow arm shoulder is pushing forward, but it is being pushed forward by the rotation, not pushing, a subtle difference. The triceps muscles of the bow arm should be tensed to help keep the bow arm steady, unlike the biceps of the string arm, which should be relaxed.