At the beginning when Luis is telling the intro to the story and he's in the tavern playing cards, it shows him throwing down the cards, if you count he throws down 5 cards, but when they show the cards that he threw down there are 4 aces..... where did the other card go????
He does throw down four aces to show the other man that he has won the hand, but he flicks the 5th card across the table because it it's important since the 4 aces wins the hand for him. Watch closely when he is laying the cards on the table before they show the 4 aces on the table and you can see him flick the 5th card across the table.