Auction proceeded:
2NT (20-22) (3S) 4H all pass
North's argument: I thought that a 20-22 2NT opening would get the strength across better than a 1D opening, and it isn't far off being balanced. 4H is to play, and I can't bid again after that
South's argument: With the 3S overcall coming in when vulnerable, the chances of 2 top spade losers seems very likely, and there is no way to "right-side" the contract, if partner has a holding like Kx(x). The 5 level doesn't really seem safe, and 5H wouldn't ask for a spade control anyway (in this partnership).
Who is more responsible for this one?

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