They should not fold, even in turn, because another player may gain an advantage over a competitor by that act.
A player who expects to be showing down the winning hand should show it immediately.It should be directed toward the muck, not the dealer’s hand.
Discarded hands should be released on a low line of flight and at a moderate rate of speed.To assist the dealer in maintaining a comfortable, fast pace of play, a player should turn all their cards face down when folding.Deliberately acting out of turn is not allowed.A player going all-in should announce that fact.Language, dress, hygiene and behavior should be of a standard appropriate for ladies and gentlemen.