So here's the situation - 4 people, all friendly at the table. 1N is alerted as 11-13. 2N is conventionally clubs and hearts, but E doesn't remember, so he thinks for about 3 seconds, then says "That's not natural" in a low but audible voice. Neither opponent asks follow-ups, and they have an accident because one of them thinks 4♥ is a transfer, and the other thinks 4♥ is to play.
N-S have been playing for about 7-8 years, and are young, improving players who, in your experience, ask about alerts before bidding - in fact, N-S claimed that they did not ask because they did not recognize "that's not natural" as an alert, and when it was asked in the play of the hand, E actually indicated that 2N was for the minors. 4♠ makes on normal play, and 4♥ went down 6. The misinformation in the play did not materially change the result of the hand.
Your ruling?
Edited to make explanation match the diagram, referenced wrong directions in the explanation originally
This post has been edited by CSGibson: 2013-October-21, 14:00