Unfortunately, we don't know who heard Player B say anything other than the "storyteller." Based on the information we were given, a decision has to be made. I've stated what I would have ruled...pot to Player A. I don't know how anyone else would rule.
TDA Rule 13: "Dealers cannot kill a hand that was tabled and is obviously the winning hand". This rule might need a little more: TDA Rule 13: "Dealers cannot kill any player's tabled hand, in for all bets, and is obviously the winning hand".