I wonder, how does one disclose tendency of the partner for "creative" actions?
Suppose, East never psyched by 1♠ (or anything similar) in this partnership previously, but is known for imaginative actions (may be, he is Zia).
At the third round of auction it is quite clear for West that something is not right in the auction. Is he allowed to guess that it may be his partner who muddled the waters and play it safe?
I have full compassion to NS, but can see nothing wrong with West.