Teams-of-eight, X-IMPs -> VPs, good standard
2♦(alerted) = multi, weak two in hearts only, or one of various strong options. No other calls were alerted.
West asked about the 2♥ overcall before bidding 3NT. South struggled to explain, and North excused himself from the table so that South could give whatever information he might be able to provide without him hearing. South said he thought it was natural, but vaguely recalled a conversation from long ago suggesting that they play this as takeout of hearts.
Result: 4♦(W)+1, NS -150
The director was called at the end of play and the facts were explained to him. When asked how he might have acted differently given a different (or clearer) explanation, West initially was unable to say, but later said he was rather put off by the possibility of North sitting over him with good holdings in spades and the minors, if indeed he had a takeout of hearts.
(This is my best recollection of a rather confused situation; if anyone who was present is listening they may wish to correct or add certain points.)
Anyway, on the facts given, what would you rule as director?