When Ye Zi saw Nagato, he knew Orochimaru had definitely evaded that burst of white light.
Since he knew Orochimaru was most likely nearby, Ye Zi's first thought was to have Orochimaru take them to the Kamui space to temporarily lie low. At the same time, he wanted to bring Madara Uchiha's lower body along and use Devour's ability to consume it. This would not only speed up the growth of his legs but also increase his strength somewhat.
Ye Zi and Orochimaru had not communicated at all, but they shared the same view. Both believed that, for the time being, they had to break away from the battlefield and find a safe place to lie low. That safe place was undoubtedly Orochimaru's Kamui space.
Through Nagato's eyes, Orochimaru also saw the situation on the battlefield. His thoughts raced, and without hesitation, he manipulated Nagato into stopping Madara Uchiha. Meanwhile, by moving through the Kamui space, his main body arrived at the location of Madara Uchiha's ruined body before Ye Zi and Kushina.
He had only seen the direction in which Ye Zi and Kushina were moving. Then, after spotting Madara Uchiha's ruined body in the distance and recalling Ye Zi's ability, he immediately understood what was happening and took action, ensuring that he could bring the two of them and the ruined body into the Kamui space at the first opportunity.
At the same time, he had not forgotten about the most troublesome presence. He had Nagato go and stop Madara Uchiha, relieving the pressure on Ye Zi and Kushina.
It had to be said that Orochimaru's assistance had come at exactly the right time. If he had not arrived at this critical moment—and did not possess such a useful Mangekyo ability—everyone would probably have fallen at Madara Uchiha's