Result: 4♠X(E)-2, NS +300. Lead ♥A
NS asked for a ruling because of the 4♠ bid after the agreed slow pass. They believed they were due +420 from 4♥(N)=. East said he bid 4♠ because he has no defence to hearts.
South led ♥A and continued the suit, allowing East to discard their diamond loser.
There are two aspects of the ruling for the TD: whether to adjust the score at all because of the UI from the hesitation, and if so, whether the defence constitutes an "extremely serious error unrelated to the infraction".
Please comment on both.