The ABCs of First and Third
A: Throw down to 2B; SS lays the tag at 2B.
When cutting the throw down to 2B, it's important to meet the ball and catch the throw on the right foot (for right-handed players). This enables the defender to throw on the very next (left) step. The second baseman should always cut the throw down to 2B if the throw is too high or off line.
The runner on 3B is the priority out in first-and-third situations, because this runner holds the threat of scoring. If this runner breaks to home at any point during a first-and-third situation, the defender should remove her focus from the runner at 1B and turn it fully to the runner at 3B to prevent her from scoring.
It's helpful to use the coach's box as a reference point when determining if the runner on 3B is too far off the base. If the runner is past the coach's box, a throw can be made to 3B. If the runner is halfway between 3B and home, force her to commit back to 3B or on to home by running directly at her (a rundown situation).