Also, you can't shoot what you can't see. I believe that the following post by Mr Saladin is an accurate portrayal of what would happen:
Jack Saladin wrote:A pirate could never "take" a ninja in a fight. Not because of the difference in physical prowess, or either being superior in technique. But because there would be no fight.
A fight would be scheduled, sure. The pirates would sail forth in their mighty ship, armed and ready for battle. They'd load their cannons, sharpen their swords, down their liquor. Right on time, they'd sail into the bay on a small, deserted island where the decisive battle is to occur.
There's no one there. The island is clearly devoid of anything more deadly than a palm tree - but, still wary, the pirates stand guard carefully for a time. There is no sound but for the slightest breeze, and the gentle lapping of the waves against the scarred pirate hull. A single leaf twirls its way out of the air to alight on the bow of the boat.
Laughter erupts. Those fearful ninjas, so gripped in terror at the concept of finally facing the might pirate hordes, have tucked their tails between their legs and headed for the hills! A million internet fanboys high-five their Johnny Depp posters, and the pirates begin a long night of celebratory drinking. They set sail for more interesting exploits, heading back to the mainland.
The ship is found three days later. Meals are laid out on tables. There's not a single trace of blood, no bullet holes in the walls, not a single cannonball fired.
And there are no pirates.