I was called to the table by South at his 2nd turn to call.
East's 2♣ was natural and limited and was alerted as such. North bid 2♠ without enquiring about the redouble.
South, at his turn, asked about the XX and received a response which began with something like "I think it means...". Not being satisfied with this answer, he called me to the table. The actual meaning of the redouble, as clearly indicated on EW's convention cards, is that it indicates a desire to play 2♣XX. This was established to South's satsifaction.
South, however, was very insistent that pairs playing an unusual system (EW is the only pair in our club that plays any kind of big club) have an extra responsibility to be sure of all actions and explanations, particularly on the first round of a not-uncommon auction. I think his whole purpose in calling me to the table was to have me lecture EW on this point. He kept restating his position and I kept agreeing with him that yes, they should have firm agreements in place on this auction.
I didn't feel like there was anything I could add at this point. South had received a correct explanation, so there was no MI. West had UI from the explanation and all the discussion, but he would have had UI anyway after a concise explanation. So I told them to carry on with the auction, but I wanted to throw the book at all four of them:
South for his attempt to badger me into badgering EW about their agreements
East for her momentary indecision in explaining what should have been a straightforward call
North for bidding 2♠ on a fairly nondescript hand without making any attempt to find out what redouble was
West for redoubling 2♣ "to play" holding ♣Kx and a balanced 5-count
When I stopped by the table at the end of the hand to make sure there were no further issues, South reiterated his point about EW needing to have firm agreements because they were playing an unusual system.
Any thoughts? Suggestions for dealing with similar Souths?