// Update is called once per frame
 private void FixedUpdate()
 {
     // set scorpion position
     scorpionPosition = rb2d.position;
     x_velocity       = rb2d.velocity.x;
     y_velocity       = rb2d.velocity.y;
     // attack if hero is close else go to hero
     if (HeroWithinRange("attack"))
     {
         anim.SetTrigger("EnemyStanding");
         Attack();
     }
     else
     {
         // detect if hero stand on scorpion
         if (HeroWithinRange("hero on scorpion"))
         {
             anim.SetTrigger("EnemyStanding");
             Invoke("UpperAttack", 0.5f);
         }
         warningAttackNr = 0;
         // follow hero if enemy see him
         if (HeroWithinRange("follow"))
         {
             enemyManager.SetOrderInLayer(-Mathf.RoundToInt((DistanceVector(ref heroManager.GetHeroPosition(), ref scorpionPosition).x * 10)));
             FollowHero(ref heroManager.GetHeroPosition(), ref scorpionPosition);
         }
         else
         {
             followHeroMode = false;
             anim.SetTrigger("EnemyStanding");
         }
     }
     // set crust
     SetCrust();
 }