I don't think so. That picture is of a "force pocket" which is a place characged with DS energy. So far, we do not know of any LS pockets. It is my general belief that, when you can't figure something confusing out, the easiest answer is the best one to go with.
I think that it somehow IS bastila and malak fighting you. Maybe they possesed sith corpses to defeat you (if your evil)? Can they do that, lol?
Edit: I have 2 requests: 1: If you want the review and can't look at the links, do NOT give me a hotmail adress. They don't accept files this big. 2: Make sure your ENTIRE email adress is spelled correctly, because I'm not going to check it, I'm just copying and pasting. Thank you