I was doing a high school JV game by myself about a year ago.
Situation: Runners on first and third, one out. Batter hits a high fly ball to medium right field. I'm watching third for the tag up and RF for the catch. RF catches the ball, both runners tag-up. The throw has no chance at getting the runner coming home and is cut off by the first baseman near the pitchers mound. The runner going to second is an easy out. The first baseman throw to second, but the runner stops, and heads back to the dugout. It is at this point that I realize that the runner going to second was actually the batter, not the runner from first. Let me be clear that he did not simply round first. He ran down to first, stopped, and pretended to be the runner tagging up to draw the throw away from home plate and towards second.
The defensive coach calls time and wants an interference ruling called on the runner for pretending to tag up. Having never seen this occur I was somewhat perplexed. The defensive coach likened it to a fake tag play by the defense. I was not sure how to rule, but I told the defensive coach that since there was no chance to put the runner out going home, and that that the runner pretending to be tagging up was already out, I would not rule interference. The offensive coach who was at third base overheard the conversation and said this it's not interference. He said it's a legal play and his team coaches their players to do this.
I've looked this up to see if there are any rules interpretations that could be applied to this. There is a rule (I've forgotten which rules book it's under. It might even be softball) that states runners cannot congregate at a base to confuse the defense. Interference could be called in this case.
How would you interpret this?