Turning off a stove on Shabbos.

shabas one of my children accidentally hit the knob on the stove turned on the fire while the igniter was still clicking fearing a safety issue I went down the road to a non-jew who happened to be a firefighter and asked him to come turn it off after turning it off I asked him if this is generally a problem with gas coming out of the stove while the fire is on he explained although the igniter is clicking there is no issue of a gas leak unless the fire is off and there is a bad smell a bad odor coming from the stove that odor is a chemical that the manufacturers put in to warn someone that there's a gas leak if this happens one should ask an onju to turn it off if he can't he can it is permissible to ask a child to turn off with aai