Then, only game admins/referees would have to watch the actual game, while any commentators or other observers would connect to the proxy match. The mirror match would act like any other observer on the main match.
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Also, it wouldn't really be far fetched to think of a kind of dedicated spectating server software that would allow thousands and thousands of viewers to connect to the proxy server with their game client, without interfering with the actual match.
Edit:
All hypothetical, I know. But the technology in itself is really not rocket science.
