Keep the clue set separate from the arrest set
Normally you expect an evil-counting announcement to refer to the actual evil targets. Fall Guy breaks that shortcut. The clue can use a special treatment rule while arrest consequences still depend on current alignment.
Write two sets if needed: “addresses this clue counts” and “addresses currently established as evil.” Their overlap is useful; their difference is the important warning. Fall Guy’s normal reference alignment is good, while an actual alignment-changing effect can still matter in the case.
Check its address when a total is one piece off
Take an illustrative case with real evil addresses 3 and 8 and a known Fall Guy at 1. The actual evil address sum is 11, but a Mathematician clue including the special counted role gives 12. That explains the mismatch without making address 1 a normally evil target.
A recent player’s “wrong sum” question was resolved by this distinction. It supports making the check; it does not mean every wrong-looking number is caused by Fall Guy. Confirm the role and address before adjusting your model.
Two further constraints to preserve
The Demo description also says other roles cannot pretend to be Fall Guy. Keep that exact restriction separate from a general suspicion about duplicates: it is a property of this role’s disguise eligibility, not a license to identify every displayed Meddler.
In the calculator, a counted-address number may need to differ from the actual evil headcount when this special role is included. Enter the count for the clue model you are testing or leave it blank. Do not silently force the faction count into that field.