Heroic killing, how does Liu Bowen divine and place the two cards he wants? Seek a detailed explanation

Under normal circumstances. You can see five cards. You can choose the card you want, drag it to the top one or two positions, and then touch the card to get one or two cards. Three four is your hand, when there is no interference. If you have a decision card now. Then position one is the decision card, and two or three is the card you want to touch. Four or five. You did it. There are five empty seats below, and the cards are placed under the pile. Novices can ignore it.