private static void CollidePlayerBullet(PlayerVerticalShooter player, EnemyBullet bullet)
 {
     player.InflictDamage(bullet);
     bullet.InflictDamage(player);
 }
 private static void CollideBulletAlly(EnemyBullet bullet, AlliedShip ally)
 {
     bullet.InflictDamage(ally);
     ally.InflictDamage(bullet);
 }