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I see two main versions: 1) This is a real hint, but kind of strange - the only moments where we are technically "run out of bullets" are the moments where the ghost attacks us. I have tried to type some combinations at these moments but nothing happened. 2) This is a type of expression - "friends" mean the gamers, "bullets" mean our attempts in clue finding, so this all mean that "the gamers stuck and here is the hint for them".