The whole Somali pirate thing does show impressive restraint, considering someone might actually have been injured by the RPG attack... they are probably lucky they weren't just blown away. I'm guessing a combo of 1) too much paperwork to bother doing that and 2) the training the US military does for appropriate level of force in response to a threat, considering it's almost like a 7-year old running up and kicking a martial arts student... not exactly a 'fair' fight... although, they did ask for it, and they could have done mortal harm to US forces, so I'd say they're still lucky, probably more #1 than #2, at least for the three on the skiff.