Opening lead: A♦, East plays 7♦...
Trick 2: 5♣, A♣, East plays 4♣...
... normal play ...
Trick 6: East (having just won the heart finesse) returns the 4♠, declarer plays A♠, West plays 2♠...
... a few more tricks and this position at trick 10:
Scoring: IMP
P 1C P 1H
P 2H P 4H
P P P P
P 1C P 1H
P 2H P 4H
P P P P
Now declarer leads the 6♠ from the dummy, and they run out of time, both sides get A- and West wants an adjustment to Down 1.
I tell him it looks like making to me, and West claims that his 2♠ promised the Q♠, and his partner will duck the K♠ so he can win and lead the last trump.
I ask East what their discard agreement is, and cannot get an answer. West calls himself Expert, East calls himself Beginner.
Would you adjust at all, and if so, would you believe West and give down 1, or would you believe that East would play the K♠ and the contract make?

Help

P 1C P 1H
P 2H P 4H
P P P P