// Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Vector3    point = new Vector3(_camera.pixelWidth / 2, _camera.pixelHeight / 2, 0);
            Ray        ray   = _camera.ScreenPointToRay(point);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                GameObject  hitObject     = hit.transform.gameObject;
                HitReaction enemyReaction = hitObject.GetComponent <HitReaction>();

                if (enemyReaction != null)
                {
                    enemyReaction.ReactToHit();
                }
                else
                {
                    StartCoroutine(PlaceSphereIndicator(hit.point));
                }
            }
        }
    }