Superman blue vs Flash

Flash is Wally west. They fight in a colloseum the size of a city(no objects, rocks, trees, etc. just a plain ring) its inescapable and indestructable. the only way out is to win. Both are aiming to win and both are ready to fight with a sufficient amount of energy. No recharging or resting, blue supes cant fly.

I don't really think they can hurt each other.

Wally can't hurt Superman.

Stalemate, or Wally speed steals.