EW are playing a Fantunes style system. After the the 4♠ bid is alerted, north asks. E describes it as 'should be EKCB, if partner remembers'.
When asked about his pass of 5♠, east says the follow-ups to EKCB aren't discussed, and that it seemed better odds that P had forgotten the system than that the opps had a 12-card spade fit unmentioned (though in case relevant, NS are playing strong twos).
The director is called, since not everyone is happy with this explanation. There is also disagreement about whether W was visibly peevish when putting down the 5♠ bid. Suppose you were that director. What's your ruling?