Where does Mars Bar start the race?

Maniac keeps going deep into the East Side, until he runs into Mars Bar. Mars Bar, like John McNab, feels as though he is the toughest person in his part of town and having been shown up by Maniac, he has taken a disliking to him. Mars Bar challenges Maniac to a race, convinced that during Maniac’s absence, he has developed enough skill to finally beat Maniac. However, Maniac not only beats Mars Bar, but also humiliates him further by finishing the race backwards and crossing the finish line while looking at Mars Bar.