enemy.cs

 private bool _fireLaser = true;
 
    void Update()
    {
        DestroyPowerup();
    }

     private void DestroyPowerup()
    {
        GameObject powerupObj = GameObject.FindGameObjectWithTag("Powerup");
        if (powerupObj != null)
        {
            var powerupPosition = powerupObj.transform.position - transform.position;

            if (powerupPosition.x < 1.0)
            {
                if (_fireLaser)
                {
                    Instantiate(_EnemyLaserPrefab, transform.position, Quaternion.identity);
                    _fireLaser = false;
                }

            }
        }
        
    }