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Phase 1
The first phase of the boss consists of three different-colored heads that will perform different powerful attacks. During this part of the fight, the boss's weak spot (a fourth head) will appear sporadically in the lower left corner of the area. When this happens, stand at the right wall and shoot the head.
Phase 2
While you are fighting the first head, Sigma's entire body will begin appearing sporadically on the right wall of the area. Stand under his gun, then jump and hit his head with the "Ryuenjin" maneuver when he stops firing the gun. This version of Sigma has less overall health than the large head, so it will be destroyed first.
Usable Maneuvers
The "Kuuenzan" and "Z-Sabre" maneuvers are highly effective against the large Sigma head, so use them during the battle.
Unusable Maneuvers
The "Raijingeki," "Ryuenjin" and "Hyoretsuuzan" maneuvers are not effective against the large Sigma head, so do not use them against it in battle.