As Su Shi wrote, "The great river goes east, the waves are exhausted, and the romantic characters of the ages" The changes of the times are like an endless torrent, swallowing up all the heroes. If it is a historical trend for the great river to go east, then even a famous minister and a fierce general will not be able to stop its waves. And those small characters who do not have their own fixed position and will only conform to the general trend can often borrow the trend of the river like a swimming fish.
Mi Fang Fu Shiren.
Guan Yu's defeat of Maicheng is uneasy in the hearts of many people, a heroic figure who has passed five levels and killed six generals, did not die on the battlefield with a horse leather shroud, but because of the backstab of his ally Dongwu, and the betrayal of Mi Fang Fu Shiren, he died in a disgraceful conspiracy. According to common sense, it is difficult for the two small characters of Mi Fang and Fu Shiren to pose any threat to Guan Yu, but the situation was already very unfavorable to Guan Yu at that time, so they could be the last straw that crushed the camel. Feng Shi is very useful in national wars, especially for harvesting characters who are already in trouble, in other words, Mi Fang Fu Shiren can use this skill to fall into the well and snuff out the life of other characters. However, when Mi Fang Fu Shiren is in a predicament, they will also be coerced by the situation, and they will be powerless to resist the fall of others, and those who take advantage of the situation will still be counterattacked after all.
Kuai Liang Kuaiyue. 
Kuai Yue foresaw that there would be chaos before He Jin was killed, so he asked to go out to avoid trouble. Later, the Kuailiang and Kuai Yue brothers made great contributions under Liu Biao, and after Liu Biao's death, they suggested that Liu Cong sacrifice Jingzhou to Cao Cao. Looking at the actions of the two of them, although they are not beneficial to the country or the people, they have repeatedly identified and taken advantage of the current situation, so as to obtain greater benefits for themselves. The skill of judging time is very in the style of the chopsticks brothers, that is, to choose the best strategy according to the situation. The yin-yang transition represents a change in offensive and defensive momentum, and as the situation changes, it jumps sideways between dealing damage and damaging strokes. If it is done properly and the conversion technique is used many times, Kuai Liang Kuai Yue is a powerful general who outputs the check card and grabs it with both hands.
Zhang He. 
potential, which can be explained as the situation on the field, the state of each commander in the game and the character itself, etc. The flexible Zhang He can take advantage of the situation to adjust his countermeasures, such as moving the delay tips on his teammates to the opponent in the jump out card stage, so that although Zhang He himself does not touch the delay tips, nor does he have the ability to print the delay tips, he can still make the delay tips produce the effect he wants. There are time-delay tips on the field, which is the potential that Zhang He needs to borrow. This ability to turn things around is not simply to follow the trend, Zhang He is to guide the trend to develop in the direction of his own needs. Of course, Zhang He can also borrow the momentum by jumping the card stage, and the generals who have a large amount of cards will generally leave important cards in their hands, and improve the quality of Zhang He's own hand by drawing their cards, which belongs to borrowing from others. Zhang He's own lines also said that "soldiers are impermanent, water is impermanent", move with the situation, and get twice the result with half the effort.
Those who take advantage of the situation can go smoothly when they go downstream, but when the situation is not satisfactory, they are not immune to the constraints of the situation. Just like what kind of momentum Zhang He can borrow is not entirely up to him, following the trend is not booking a winner.