we all figure the duel is probably a lock without any doubt that obi-wan and anakin will duel thus the "lava bath" etc. but aside from anakin saying "en garde" --- what will be the ultimate instigator for them to stop talking and start swingin!!! i say: padme goes on a jedi sanctioned mission that ani believes she should not undertake ani does not want padme (his new wife) (and possibly he knows of his new PREGNANT wife) putting herself in any kind of danger perhaps palpy has caught on to the marriage somehow so palpy ends up convincing ani that padme somehow dies on this mission thats the last straw for ani, and while he KNOWS the jedi sent her, maybe obi-wan had something in particular to do with sending padme on this mission ani goes "dark" and is so angry for not preventing padme's death in the same way he did not prevent his mothers death !!!!! as ani takes his revenge,, obi-wan arrives to see that ani is turning to the dark side, killing jedi, killing dooku (?) and.... herein lies obi-wans greatest failure... he cannot calm / convince ani to see through the lies/deceit/anger and remain a jedi what do u think?