At T–8.9 seconds, an electrical signal was sent to the igniters, and four small, silent flames lit within the combustion chamber of each of the F-ls. From that moment through liftoff, there was nothing Petrone or anyone else in the Firing Room could do. If something went wrong, the sensors would know it before the news could reach the Firing Room, and the Saturn V would shut down its engines without waiting for sluggish human beings to instruct them.
