[lamford]

VixTD, on 2014-March-31, 07:12, said:

It did cross my mind that some partnerships might have an agreement that the pass over 5♥ is forcing, but I didn't think many would, and I was sure that those that did would have mentioned it when asked as a reason for passing and then bidding 5♠.

Maybe she thought it was "obvious" that pass was forcing. North was prepared to play in 2♥ a short while ago, and has now sacrificed in 5♥. However, I suspect that this particular East just bid 5♠ because she had extreme shape and no defensive values.

The only solution is to poll people of the same strength with the authorised auction. I see that you did that, and some passed the double of 5H, in which case I agree with your ruling.