public override void Visit(ShipBulletLeaf a)
{
CollisionPair pair = ColPairMan.Find(CollisionPairName.Alien_Bullet);
pair.SetCollision(a, this);
pair.Notify();
}
public override void Visit(ShipBulletLeaf b)
{
CollisionPair pair = ColPairMan.Find(CollisionPairName.Bullet_UFO);
pair.SetCollision(b, this);
pair.Notify();
Score.Add(Rand.GetNext(50, 100));
}