When West led the 10 Declarer played the K from Dummy. The Chagas knew where the Q was . If his partner held it Declarer would have played the J. He knew the only chance for the defense lay in a trick to go with the and the to come. So , quick as a flash he played the J.
The poor declarer thought it could be a singleton! Expecting there to be no trump losers he rose with the Ace. Imagine his horror when trumps did not split and Chagas held the K.
What Chagas did here was use his imagination to find a scenario Declarer could have a problem and choose the wrong play, bravo Gabriel.