You do NOT want to legitimize BEANS' sudden and swift spiral into delusion by playing into his PARANOIAC FANTASIES. However, he's your friend and clearly trusts you a great deal if he's openly sharing his "valuable" "work" with you.
Could be worth playing along. What's the worst that could happen? You don't recall possessing any of your own IMPORTANT TASKS today. Maybe you'll get something out of it.
You perk up at the idea of indulging your VIOLENT URGES and neutralizing a pair of demons disguised as children.
Being a SPY sounds fun. Besides, you're nosy and you know it.
Later, if you're lucky, BEANS will snap himself out of this mental episode, realize his task is a FOOL'S ERRAND, and you'll get a sweet opportunity to say "I told you so, BUCK-O."