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Dave,
Normally the libero, when they reach the Left Back (LB) position, would have to sit out the next rally when she is to rotate to the Left Front (LF) position. However, she does not have to do this if she is going to serve. What you are seeing is actually two libero replacements. The player running on to the court in to the LF position is replacing the libero. The player running off the court, from the Right Front (RF) position, is being replaced by the libero, who is moving back to serve. Since these are replacements and not substitutions, the exchanges must occur behind the 10' attack line, and not within the substitution zone. Since the libero may only serve in one spot in the order, this can not happen each time the libero is to rotate to the LF position. You might typically only see it every other time through the libero's rotation.
I've heard this referred to (informally) as a dipsy-doodle or something along that line.
Hope this helps!
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