All average club players. IMPs. When I arrived, East agreed to partner's hesitation but added the common "I was always going to bid 4♠. Here, look at my hand." I declined the offer, told them to play it out and then call me back IF THEY WISHED. I forgot to find out whether 1♠ showed 5. Suspect this pair did not make that distinction.
Looked at the hand record. East seems to have an easy 4♠ first time. Note however that there is a set of players who sometimes bid like this. Their jumps are almost forcing. They might bid 3♠ then 4♠ when partner failed to act over 4♥. "I didn't want to let them play 4♥." To what extent am I required to get inside their heads, to think as they do? (No peers available)
Anyway, while they were playing I decided to wind back to 4♥ passed out, though there is a case for allowing East to double 4♥. (However, West's hesitation may indicate a desire to penalise, making double by East more attractive) Also had to decide how likely it was for East to lead a low club at trick 2. These finer points could wait so I hovered a couple of tables away till they completed the play. I caught South's attention and gave her a quizzical look. She looked at her partner and they both shook their heads, so I walked away. Is that acceptable?
We all use our own words but I find these rulings difficult to express, since I'm about to tell East she is being unethical. I was going to say "Change the contract to 4♥/S making 9 tricks. When you bid only 3♠ first time, you can't then bid 4♠ when partner hesitates."
Maybe "shouldn't" instead of "can't". If pressed I would add "Partner's hesitation makes it more attractive for you to act, therefore you shouldn't"
Some directors prefer the formal, legal approach. "You partner's agreed break in tempo has conveyed Unathorised Information to you, that partner was considering acting over 4♥. When in receipt of UI, the Laws require you to choose - from Logical Alternatives - one that was not suggested by partner's break in tempo. Pass is a Logical Alternative, therefore I'm adjusting to 4♥/S making 9 tricks."
Which approach and which words do you use? Does you approach vary with the standard of the players?