baserunning and pitcher/fielder question

[splitveer]

First of all forgive my lack of verbage when trying to describe this situation.

We have a runner on first base because they hit a single to the outfield. The first baseman goes to the circle to take the throw from the outfield while the pitcher is standing near second base. The first baseman has the ball in the circle with the ball and hand in the glove.

Does a fielder have the same provisions as the pitcher when it comes to the runner committing to one base or the next? So when the first baseman has the ball in the glove in the circle the runner must commit to one base or the next...

Or can the runner play with the first baseman because they are a fielder and not a pitcher.

Thanks for the help from this first year 12U softball coach. Oh, by the way I am looking at ASA and USSSA rules applications.

THANKS!