This was one of the flattest boards of the event in the Welsh Senior Trials but the traveller hides the actual auction. I was South and while I was considering whether to open or not (we were playing a weak NT), it was clear from some discussion that there was something amiss on the North-East Frontier. The tray had been passed through perhaps 20 seconds earlier, but it was clear from the discussion that there was something wrong. I decided as South that I should now not make a call until the TD was summoned (as I had UI from another source) and my opponent called her at that point. The TD arrived and advised me after investigation that East's pass was inadvertent, and the screen was moved back to the other side of the screen, and East replaced Pass with 1C. The opponents now bid 1C-1H-4H, uncontested, and game made for a completely flat board.
East had alerted his pass and described it as "could be 2" (not heard by me), and my partner thought East was having a senior moment, and queried the alert (not heard by me), and eventually it became apparent that East had not intended to pass from the conversation at the other side of the screen (which should have been written of course). Reading the screen regulations they seem unclear on whether an inadvertent bid can be corrected, so I think that normal laws apply and it can be changed. If I had passed it out, would the auction still have been rewound?