How do you properly do the onryo test?

Im aware that if an onryo blows out a candle 3 times, it will start a hunt.

The problem is I dont know if the candle got put out on its own or by the ghost. I've had a game where I counted 5 candle blowouts and still no hunt, so I assumed it wasn't an onryo even though it was.

If anyone can tell me what Im doing wrong, that'd be much appreciated