private void OnTriggerExit2D(Collider2D other)
 {
     if (other.transform.CompareTag("Player"))
     {
         mech = other.gameObject.GetComponent <MechBase>();
         mech.ChangeSafety(false);
     }
 }
 private void OnTriggerEnter2D(Collider2D other)
 {
     if (isActive)
     {
         if (other.transform.CompareTag("Player"))
         {
             mech = other.gameObject.GetComponent <MechBase>();
             mech.ChangeSafety(true);
         }
         else if (other.transform.CompareTag("Projectile"))
         {
             Destroy(other.gameObject);
         }
     }
 }
    public void Update()
    {
        if (isActive)
        {
            aliveTimer -= 1.0f * Time.deltaTime;

            if (aliveTimer <= 0)
            {
                isActive = false;
            }
        }
        else
        {
            transform.GetComponent <SpriteRenderer>().enabled = false;

            if (mech != null)
            {
                mech.ChangeSafety(false);
            }
        }
    }