The Ratmen are an evolved version of the rat. They are bipedal now and instead of using their tail as their main way of attacking they instead use a bomb projectile. One hand of the Ratman will begin to charge energy, it will then throw the bomb and the bomb will head straight in whichever direction the Ratman happens to be facing, but when it hits the side of the screen it will begin bouncing around at random angles. The best way to avoid this attack is to stay away from the corners and keep a safe distance from the bomb when it stops moving since it will explode afterward. Also if Aya Brea were to get close to the Ratman it will try to bite her.