So... i have this really silly story where someone loses her memory, and as a result, ends up ythinking she is some sort of a Jasonn Bourne-esque trained killer type. Now, i want her to have solid reasons for believing this; before the amnesia happens, she is v. athletic, and her hobbies involve shooting and martial arts. She studies languages, too. Now, what I need to know is, what sort of "common" matrial arts could she have been learning that would be best for mangling people? Not flashy but brutal/efficient?