//Mutators
 public void returnAnEnemy(Enemy1 enemy)
 {
     enemy.reset();
     this.z_EnemyPool.Add(enemy);
     this.z_EnemyPool.Last<Enemy1>().setPointer(++this.z_counter);
 }
 private void AddAnEnemy(ref Enemy1 enemy)
 {
     this.z_enemyShips.Add(enemy);
     this.z_enemyShips[0].setIsAlive(true);
 }