Teams, both pairs are strong (E/W are European Champions), screens
West North East South
1♦___1♥___2♥(1) pass
3♣(2) pass 3♥(3) pass
4♣(4) pass 4♠(4) pass
5♦(5) pass 6♦ all pass
1: Invitational+ with 4+ diamonds
2: Natural, not minimum
3: Asks for cue-bid (unlike in my system it did not promise a heart-control even when followed by a cue-bid)
4: Cue-bids
5: Very slow. While the tray was on the other side East actually told his screenmate that he would raise 5 diamonds. It seems this happened after almost a minute, the hesitation then lasted almost two minutes longer (this was agreed).
6♦ made an overtrick (North did not jump in with the ♠A). When the TD is called East says he cue-bid 4♠ because he wanted partner to bid 4NT (RKCB) to get better control towards a grand slam.
The TD adjusted the score to 5♦+2. His argument was that the long hesitation suggests 3 "aces" (of 5) lacking a heart-control. Since the hesitation was already established Easts comment to his screenmate did not matter. Easts reluctance to bid RKCB may have been because he feared a 5♥/♠ response, driving them too high lacking 2 aces. This also suggests that passing 5♦ is a logical alternative. I don't know if he conducted a proper poll, but when I was asked I knew about the hesitation and told him something like "Most strong players would probably raise 5♦ to 6, but pass is probably a logical alternative".
E/W appealed based on pass not being a logical alternative.
How would you rule? Feel free to ask, but I have already listed what I found relevant from the appeals form. In our match (not this one) both tables bid to 6♦ (I was North), the deal was played at 10 tables of which 1 stopped in 4♦(!), 1 in 3NT and 1 in 5♦, the last 7 (including this) were in slam (one in 6NT) (these frequencies were listed on the appeals form).
John