@son_of_tomorrow: When you are trying about Superman's invulnerability it makes things easier if you remember that his invulnerability is relative and not absolute. Relative to a normal human being Superman is invulnerable, but not as invulnerable as lets say Galactus. I hope that helps clear it up at least a bit. Cool Hashirama icon for your avatar by the way.
I can see an argument being made that Wolverine may figure that the ninja is vulnerable to water, and since they are in an area surrounded by a lot of electrical wiring he may try to use it to his advantage.
Battle Intelligence: Suigetsu was hired to bring in Logan to the Yakuza dead or alive. The battle takes place in the streets of Tokyo, where the civilians have fled from the fight scene. If Wolverine is only armed with is claws, and Suigetsu only with his sword who will win?