Alexander held a small council upon his scouts' report of the king's intention to assault his camp.
And there he declared to his officers, "We will not fight Perseus here. There is no need to. We will bait him to give us chase further into Tibias."
"This will not only put strain on his supply train but also tire him out."
"We can also use the time to raise some reinforcements from friendly cities, such as the garrisons."
And to the officers, all these reasons that Alexander gave sounded quite good.
However, although sound, in reality, these were only rudimentary reasons, as Alexander kept the truly insightful ones restricted to him and his very close internal circle.
Alexander considered much of the intel he had received from the defecting messenger top secret and fearing a leak relegated it to only a few very trusted ears.