If a challenge is created, the cards are unveiled. If your former player was bluffing, they need to get the entire pile of playing cards. When they weren't bluffing, the challenger need to pick up the pile. You might want to stay clear of unnecessary calls early in the game. https://elliottaludj.blazingblog.com/39200083/an-unbiased-view-of-what-are-the-rules-for-deceiving-opponents-in-bluffing-games