I think that pirate had scurvy, and/or rickets. This is probably the best plan ever. Make sure you warn the ninja to wait until the pirates board the ship before attacking, because I think in an open water situation the pirates have the upper hand. I don't want any gung-ho ninja spoiling the plan.

Also--I really enjoy the way the ninja star was thrown--not quite in a straight line, and not with the usual spin. I like this ninja and I think the government should hire him immediately.