Same rules apply as when signing up for beta duty. You don't have to be a member/participant in the exchange to be a pinch-hitter, just someone who can turn around a thousand word fic in a short time frame.
*Pinch-hitting is what happens when a writer drops out of the exchange for some reason and someone steps up to write the abandoned request. That someone is the pinch-hitter.
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Fic I can't write:
Thank you! :)