#1 4♣ was alerted at west's side of the screen as 6♠ 4♥ althou it was obvious she wasn't sure. At east's side no alert was given.
There was a long pause before the tray came back with 4♠, and I think this can be UI for west that they are not on the same wavelenght and bid 6NT.
south had ♦Kxxx ♣Jxx, but hearts not breaking if I recall correctly, needs to missplay trumps or do something wild with a ruffing finese in diamonds to go down in 6♣. 6NT made comfortably after a diamond lead.

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