private static void CollideEnemyAlly(EnemyShip enemy, AlliedShip ally)
 {
     enemy.InflictDamage(ally);
     ally.InflictDamage(enemy);
 }
 private static void CollideBulletAlly(EnemyBullet bullet, AlliedShip ally)
 {
     bullet.InflictDamage(ally);
     ally.InflictDamage(bullet);
 }