public void OnAbilityUse(GameObject btn)
{
fillImage = btn.transform.GetChild(0).gameObject.GetComponent <Image>();
//UnityEngine.Debug.Log(btn.transform.GetChild(0).gameObject.name);
button = btn.GetComponent <Button>();
button.interactable = false;
fillImage.fillAmount = 1;
cooldownTimer = new Stopwatch();
cooldownTimer.Start();
GameObject go = Instantiate <GameObject>(fireballPrefab);
go.transform.position = new Vector3(this.transform.position.x, this.transform.position.y + 1f, this.transform.position.z);
fireball = new FireBall();
fireball.AbilityPrefab = go;
StartCoroutine(SpinImage());
fireball.Activate(gameObject);
}