public void Potion()
{
int nbPotion = wm.GetNumberPotion();
//Debug.Log("nb " + nbPotion + " wave " + wm.GetWave());
if (nbPotion > 0 && wm.GetWave())
{
wm.DownNumberPotion();
nbPotion--;
gm.WakeUpAllGuard();
instancePotion.gameObject.GetComponentInChildren <Text> ().text = nbPotion.ToString();
}
}