Partner, sitting West, was dealer and he opened 1H:
At match-points, that 7S bid was quite silly. Partner's two key cards are the Ace of clubs and the king of spades. Since my 7S bid assumes that partner must have the King of hearts for his 1H bid, I can count 14 tricks. 7NT is what I should have bid.
Fortunately, it turned out to not matter. No one else opened the West hand, and so, the rest of the field found only 6H or 6S. 7S was a cold top.