At night, a blocker will block one of the pair, Neyra-Arandor.
Even if they don't succeed and kill one of the townspeople, it will still be clear who the Mafia is, and they will be proven guilty.
It's a foolproof plan. Unless the Mafia skips their turn every night, hehe.
I think one of the GMs had a rule that you can't skip a turn, or skip two turns in a row, I don't remember.
Execute Kosha.