my impression is the brother *thought* Holly was out talking with her boyfriend & went on about his biz & then when he noticed her car still there- but no Holly, he called the boyfriend & found out he was at work.
I think LE or a reporter saw the blood. that part of it may have not been a big deal to the brother because they are all hunters & that might be animal blood. unless it was super fresh and a lot of it- which i kind of doubt b/c if she was already injured- i think she would have screamed for her brother, believing she had nothing to lose at that point.