This is a case I found interesting from the Norwegian third (of four) division. Players are good, but not top-class. N/S play High-Low doubles, 2♥ was non-forcing. According to Norwegian alert regulations 2♥ was clearly alertable, but North failed to alert. I was not present and I don't know when the opponents were correctly informed and the TD was called (I don't know if East got the option of changing his final pass, but E/W never claimed that he would bid anyway). Play continued, 3♥ went down 1 and the TD was called back. E/W claims that correctly informed West would bid 2♠ after which E/W would reach a making 4♠/5♣ or get at least 500 from 5♥X.
How would you rule? There is a follow-up, but these are the facts presented to the TD.