Just because somebody is running ahead of you doesn't mean that you will lose the race.
Don't stop, keep running.
If the race has just been started, you can't make any assumptions about who will lose in the end.
If the race is near to its end, stopping is anyway going to waste all your effort.
In the middle of the race!!! "WHY YOU STARTED AT ALL AT THE FIRST INSTANCE IF YOU HADN'T PLANNED TO COMPLETE THE RACE?"
So again, No use of stopping, RUN better every time someone gets ahead of you.