/// <summary>
    /// Shoots to enemy.
    /// </summary>
    private void Shoot()
    {
        GameObject       _bullet = Instantiate(bulletPrefab, firePoint.position, firePoint.rotation);
        BulletController bullet  = _bullet.GetComponent <BulletController>();

        if (audioType == 1)
        {
            int ran = Random.Range(0, 2);
            if (ran == 0)
            {
                mAudioSrc.Play();
            }
            else
            {
                mAudioSrc2.Play();
            }
        }
        if (audioType == 2)
        {
            mAudioSrc.Play();
        }
        if (bullet != null)
        {
            bullet.ChaseEnemy(target);
        }
    }