To kill them, you had to avoid their projectiles, then return fire with a strong long range weapon. They were members of Captain Slag's crew. Rusty Pete referred to himself as a corsair at one point, and he is also shown with a gun in concept art, suggesting that he may be this class of pirate. Once Ratchet reaches Jasindu the corsairs gain red armour like the other space Pirates. They now have stronger attacks and are tougher to beat. In Ardolis, there is a skill point, called "Taste O' Yer Own Medicine", which can be obtained by defeating all corsairs in Ardolis using only the Combuster.