Originally Posted by Astor_Kaine
No, he didn't kill a Jedi Master first time - he fought a stalemate on Tatooine, or did you forget that?
He got killed because he was overconfident in his situation - there's no way a mere padawn could kill a Sith Apprentice, right?
But none of that is proof that he knew how to use Force Lightning.
... or prove that he cannot.