What would the ruling be?

[Chipr777]

I can see this going either way depending on the cardroom and the floor. I can play devils advocate for both sides of the coin. In what seems to be cut and dry situations, decisions can be made in the "best interest of the game", even if it clearly contradicts the rules. The bystander violated the one player per hand rule and the players clear intent was to fold. On the other hand the cards haven't touched the muck and therefore are still live. When you combine the players initial intent to fold and the comments of the bystander I would rule the hand dead in the best interest of the game.