Said Discordian could out him/herself, and that would be a sound way to at least offer temporary protection, but I'm not sure if that would complicate things, since it would also give the other Discordian an advantage to form a cabal. On the other hand, that might not be tactically wise either, since it would be better for the Discordian to try and convert someone else to bolster the numbers.
LMNO?
ETA- if LMNO allows the Discordian to out themselves, it should be with the stipulation that he confirms the Discordian's identity in order to prevent the spiders from claiming to be a Discordian. Maybe it could be something like, the other Discordian should not attempt to convert the outted Discordian, since that would be backsies. Said Discordian could still try to cabal with the non-outted Discordian.
The downside of course is then the Discordian would have 3, instead of 2, spiders on his/her tail.