Any play at all would make the LBR moot. It doesnt even have to be a throw.. a fake throw, stamping your foot in their direction - any thing that can be considered a play on the runner by the pitcher in the circle means the LBR does not apply. They pitcher must stop making plays and stand there in the circle for the LBR to be enforceable by the ump. Like I said above, i see way more of this goofing with a runner than LBR violations... The players go back to their base if the pitcher has the ball in the circle in my experience. They may not know the exact rule or may have never even heard the term LBR, but the coaches teach them to get on the base and stay there when the pitcher has the ball in the circle... so thats what they do (Dakota's league excepted of course