To paraphrase Lewis Carroll...things are getting seriouser and seriouser! Nor can I blame Stan for being both puzzled and frustrated. I, too, got almost all the coded message except for the squirrel part. I can only guess that it might be Deacon's way of saying "nut-eating vermin."

Author's Response:

Squirrel was the code word Deacon and Stan shared toidentify themselves to one another, just the word, context is irrelevant.