I actually have the same question. It doesn't sound like they explicitly state what Fallon's finger is doing. I have a guess, but with the disclaimer (Answering the question to prove you listened to the latest episode with something unrelated (Ex. The question asks for a name and you provide a non name answer) will result in you being disqualified from winning, abstain from answering if you are just guessing.) makes me hesitant to guess that, as I can't actually verify that. I don't want to be disqualified because I'm not sure.
Is there a way we could submit our guess to verify it is what we think it is, without potentially risking disqualification because we aren't sure of our guess?