Lay the card on the throne, or on one house. The hall watches that placement.
Three ways one favor can land
The same favor can be seen by the whole hall, known only to the house across the aisle, or turned face up. Those are three different acts.
Hand the card to the house opposite. The meeting is the only witness.
Turn a house with a person card or with leverage, and the hidden side faces the table.
Those three acts step aside. The hand then orders, gifts, or removes a house, or it names, pardons, or sets one down.