Wikipedia Quote: ..."Brazilian Jiu Jitsu promotes the concept that a smaller, weaker person can successfully defend against a bigger, stronger assailant by using leverage and proper technique most notably by applying joint-locks and chokeholds to defeat the other person. BJJ training can be used for sport grappling tournaments (gi and no-gi) and mixed martial arts (MMA)." Would it be possible that a perpetrator with advanced knowledge that Rebecca had Jui Jitsu training then planned an ambush and knocked her unconscious before she ever knew what hit her? That would explain Rebecca's head wounds and why she was tied up. Imo, she was probably unconscious when and then she woke up tied/taped to the chair. She may have only had time to let out only one scream before she went unconscious, imo.