Your comment about her hair made me remember that there is mention in this thread that he put underwear on their heads. The break room where they were all held was probably very small. She may have also had blood splatter on her from the other victims that were shot before her.How he missed the last person is probably a combination of factors. Firing a gun indoors is extremely loud and can be intimidating to the shooter as well as the victim. I fired a .22 at a rat in a shed that stored grain and my ears were ringing from just that small caliber. He was probably in a rush to get out after the first 2-3 shots were likely heard outside. We also don't know how the victim was wearing her hair so the shooter thought he hit where her neck was. If this guy was shooting a medium caliber like a 9mm, .45 or .40 his ears were probably still ringing when he exited the building.