public override bool Shoot(DateTime now, List <Bullet> bullets)
 {
     if (now.Subtract(m_lastShot).Seconds > 2)
     {
         EnemyBullet b = new EnemyBullet();
         b.Discharge(m_x - m_width / 3, m_y + m_height / 2, -1, 5);
         bullets.Add(b);
         bullets.Add(new EnemyBullet());
         bullets[bullets.Count - 1].Discharge(m_x + m_width / 3, m_y + m_height / 2, 1, 5);
         m_lastShot = DateTime.Now;
         return(true);
     }
     return(false);
 }