Anakin had the lightsaber in his hand and when he was told to kill count dooku, it was meant to be during a thumb war. the dark side has annual thumb wars on October 31st. since they are too old to go trick or treating. Count Dooku never lost before which made him intimidating to Anakin.
when Anakin lost in the third round, Count Dooku was a sore lwinner. he took all his clothes off and danced around. Anakin left and never came back. he had seen what he shouldn't have and it kept replaying in his mind over and over again.