Obstruction

[youngump]

Originally Posted by mbcrowder

In the OP, you have a runner obstructed between first and second base. She cannot be called out between first and second (unless she commits some other violation). Other than an intervening play on another runner, there is no "waiving off" of this protection. The runner "giving up" and beginning to return to first has ZERO effect on her protection.

To clarify slightly what Mike is saying here. There is one case where the runner getting back (not starting back) to first effects her protection. And that is the case of the intervening play. If a runner gets to the protected base (1st in this case) and then the defense plays on another runner, the protection from obstruction is over.