Wonderful fragments in the story of "Empty City Plan" (and talk about how wonderful? )

In fact, Sima Shi told Sima Yi that there were no soldiers in the city at that time, but Sima Yi was afraid that Zhuge would cheat. In fact, he can send a team to explore the enemy's150 thousand army first, which does not mean that it can be annihilated. But if this is the case, then the three armies will fall and pay more casualties, so Sima Yi is in no hurry to retreat.