I do have one explanation for the shoulder blade bruises, based on classes in self-defense. It is not uncommon for a man to throw his arms around a woman (as if in a big hug, but with her arms pinned to her side), and then hold them as tightly as possible, in order to move them to a place where the assailant is more confident in what he's about to do next.
His right hand would have therefore been on her left shoulder blade, and it's likely his left hand would have been lower, on her right side rib cage, which we can't see.
Here's a review of self-defense techniques that shows a frontal hug/control position: