Unless they got rifles they're going to be hurting after a pissed off group of somalis teaches them and future "clients" not to put up with them. They better have the armed security option onboard. Hopefully they got a sniper rifle too, since they're going to need it in the future. When somalis find out there's a good probability of guns onboard a ship they will be prepared to take potshots at the ship from a range. I'm sure they'll have enough capital to buy some nice launchers to give them enough range to stay out of the gun range. I wouldn't rule out a mortar either, since it's cheap; just put it on top of a simple gyroed platform and you might actually hit, it's not like they're in a hurry. Probably wouldn't even have to use it after couple of splashes which after the crew is wetting their pants and willing to drop their guns.