When B2 swings and misses, hitting F2 with his follow-through, what is the ruling?

In this scenario, when B2 swings and misses, hitting F2 with the follow-through, the ruling aligns with interference regulations. The critical factor here is that the action of B2's follow-through interferes with the catcher (F2) attempting to make a play. According to the rules governing interference in baseball, when a batter's swing inadvertently hinders a play at the plate or affects the fielder's ability to make a play, it generally results in the batter being called out. Also, since R1 was on base at the time, they are returned to first base because the play is ruled as an interference, negating any potential advancement that could have occurred. Thus, this ruling properly addresses the situation as per the official guidelines of the game.