What happens to R2 during an obstruction if he was not attempting to steal?

In the scenario presented, if R2 is not attempting to steal and is simply the victim of an obstruction, the appropriate ruling is that R2 remains at second base. This is based on the understanding that the player is not guilty of any infraction. Instead, the obstruction has no impact on their status at second base.

When obstruction occurs, the play may be halted, and R2 can generally be allowed to advance if they were attempting to do so at the time. However, since R2 is not trying to steal or advance while being obstructed, their position at second base is maintained. The rules protect the runner's right to the base they have legally occupied while recognizing that they were impeded in their advance by the obstruction.

Other options suggest either automatic movement to third base, being declared out, or being sent back to first base, which would not be applicable in this scenario given that R2 was not making an attempt to advance. Therefore, the correct answer is that R2 simply remains at second base due to the nature of the obstruction and lack of any attempt to steal.