His "Gwahaha!" attack is the strongest, while "Oww!" results in Baku tripping and missing his target. The Masked Man has a Mage Masher to be stolen, a weapon upgrade for Zidane. It is not difficult to steal considering all four characters have the Steal command.
For this battle, a game over is impossible, as the game continues even if the party is annihilated. If a party member ends up in critical health during the battle, Baku will advise the player to use a Potion to heal up after the battle.