I tried to remove a religion from one holy city of rival religion. I thought that would be a way to remove a rival holy city. However I could not perform the necessary action with the inquisitor, because that alternative was not available. I moved the inquisitor to one of my own cities and there I was able to remove the rival religion. Why was I not able to remove the religion in my rival's city ? Does the inquisitors special ability work only in my own cities, or does the city have to have also my state religion ?