Would you let 7 stand?

West
J875
9
K876
9853
North
94
AK32
AQJ
A1062
East
1032
J754
10952
74
South
AKQ6
Q1086
43
KQJ
W
N
E
S

1
P
1
P
2
P
2
P
2
P
3
P
3
P
3N
P
4
P
4N
P
6
P
7
?
D

Setting: Championship with screens against world-class players.

1= 2+, 1 would be 4+ and a fairly decent suit. 42 or 43 with AJ8x A10(x) would be opened 1

1=

2= a) +, 16+ b) GF  c) 18-19 bal & 4

2= 8+ (GF) relay

2= c)

3= values/fit-ish

3= non-serious

3NT=  cue

4= RKCB

4NT= 1/4

It took north about 30 seconds to bid 6 and after about 2 minutes, south decides to raise to 7. As he pushes the tray over to the other side, west asks: "Did you hear something?" which south denies. After the board, west calls the TD and explains he heard a pair at another table saying "what does that score?" "2210" right before we started this board. Furthermore, he thinks north's hesitation before he bid 6 might have influenced south's decision to bid 7.

South insists he heard nothing, and explains he has enough logical reasons for bidding 7: Partner must see all Keycards, since with a KC and Q missing, he wouldn't bid 6. So (given that trumps break 3-2), south can count 12 tricks (3, 4, 1, 3, 1 ruff). If partner has a 4th  (which he is very likely to hold according to their agreements) or K, he always has a 13th trick, otherwise he'd have to rely on a finesse. He'd have to be very unlucky to find partner with Jxx AKJx AJxx A10x. This is pretty much the only hand partner might have on which he'd open 1 and with which 7 has no chances of making, but if he really has this, then probably he shouldn't have bid RKCB but cue instead and let partner ask. South believes his partner can't have a 4 card since he then wouldn't have a) bid RKCB or b) jumped to 6.

Was this the right way to handle things by west? Shouldn't the TD be called because of possible UI before we start the bidding and/or shouldn't he call the TD about the hesitation during the bidding, instead of after the play?

Also, I'd like to ask your opinion on the 4 bid by north and whether you think a 6 bid by south would have been a better alternative to 7.

What would you decide as a TD? What might the hesitation before 6 suggest? And does the possible UI from the other table influence your decision?

Score stands, because whether or not S heard something is irrelevant and the 7 bid is logical despite the hesitation
Score is changed to 6 because of the hesitation, pass is a logical alternative.
Score is changed to 6 because you believe South made use of the UI from the other table.
Score is changed to 6 because a) 7 isn't logical after the hesitation AND b) you believe south used the UI from the other table

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