If B5 passes R1 while running to first and R2 has just touched home, what is the ruling?

In this scenario, the ruling is that the run does not count if B5 passes R1 before R2 touches home. This is based on the concept of base running and the obligation of a batter-runner to legally touch the bases in order. When a runner (in this case, B5) passes another runner (R1) who has not yet advanced beyond the base they occupy, it creates a scenario where the integrity of the play can be affected.

If B5 passes R1 before R2 has legally scored (touched home plate), B5 is deemed to have committed an infraction of running out of order. This action nullifies the run scored by R2, even if R2 had reached home before B5's infraction was observed. Therefore, the critical aspect is the timing of B5's passing R1 in relation to R2's legal touch at home plate, which leads to the determination that the run does not count for the team.

Understanding this concept reinforces the rules of base running and the importance of following the sequence of the bases in order to ensure all runs are valid and counted appropriately.