I think you misread/understood what I wrote.
Fuel not off & spark ignition not off.
In this case :
The ignition wont turn off (kill circuit inoperative)
AND
The fuel wont turn off
Engine keeps running despite operator thinking kill circuit (switch/button/lever position) activated...
FACT:
An engine will not continue to run if:
The fuel supply is cut off
The ignition (in a spark ignition engines) is grounded
Its not receiving sufficient O2 (air) to support combustion (not usually used to stop an engine)
Should a spark ignition engine continue to run after ignition turned...