It's the Middle Ages and you're explaining to someone how to play rock-paper-scissors. You say:
Cisorium pergamenum vincit.
Wait a minute. Both of those nouns, being neuter, are the same in both nominative and accusative. Latin has free word order and parchment is pretty tough, so—what beats what?
More to the point, how do you sort out this kind of ambiguity in Latin if you can't think of a masculine or feminine synonym? Depending on the listener to use sense to disambiguate won't work here, because you're explaining the rules of a game, which are somewhat arbitrary. So, do you call upon conventions for word order? Do you add more words?