After Alexander entered the capital, he quickly got to work getting to know about the latest situation.
With his first and most immediate inquiry being - "Where is Perseus now?"
"The scouts have located the king four days west of here. But at the moment he seems to be moving south." Menes quickly reported, aware of such a thing because he had sent a detachment based on Lord Theony's intel.
Hearing Perseus was on the move, made sense to Alexander, as he felt he could understand Perseus's line of thinking.
Alexander had been told the entire truthful story of Lord Theony's coup d'etat, and one of the conclusions that Alexander came to hearing that was surely the Crown Prince had already reached his father or at least managed to send a message, informing him of the loss of their capital.