private IEnumerator DoDamage(GameObject city)
{
while (city.activeSelf)
{
yield return(new WaitForSeconds(cooldown));
if (city == null || !city.activeSelf)
{
yield break;
}
if (city.GetComponent <Health>().DoDamage(power))
{
Game_manager.KillCity(city.GetComponent <Stadt>());
}
}
}