If west pitched a club, Jacques could play ace and a club, setting up the club J while still holding an entry. In reality, west pitched a spade, Jacques played the two black aces, then endplayed west in clubs, forcing him to give up a heart trick at the end. Thus we see the error of east's play. If he had played the 8 of club, he could have held two clubs guard, and west would have been able to pitch a high club. This would be the end-position if east had played the club eight at the first trick.
East has to keep two clubs to keep west from being squeezed.
Now Jacques ducks the club ten the west's K, wins the spade or club return, cashes the other club and exits a low club. So the misplay did not cost east anything. Bidding and making 3NT was good enough to get a majority of the matchpoints. If west had pitched a heart, it would have required an iron will for Jacques to duck a heart. Jacques, who showed me this hand, claimed he'd figured out the position, but it's certainly better to make him work for it.