yo actually she did not just kill him by stabbing him in the chest right away. he did lose concentration, which then let her use the force to conjure up demons and monsters from the back of his mind and then they would spawn around him, and only he could see it. then he dropped his lightsaber in fear of the monsters and then she walked up and stabbed him, then went to help darth bane. --Tfriedell 20:53, 7 January 2009 (UTC)
he didn't drop his lightsaber in fear of monsters, he dropped it when he was dead. When he went mad he used his lightsaber to protect himself.