Lapitus's sneak attack from atop the second wall quickly died down under the effort of Zanzan's crossbowmen, soon enabling those on the walls to come out of their cover and occupy it.
On paper, the man's plan had not been a bad one.
Lapitus seemingly devised a kind of elastic defense where under Alexander's attack, he would give up his position and retreat to his next stronghold, baiting Alexander to take the vacant place, and then, once Alexander had used up his energy getting there, Lapitus would launch a counterattack to push him back and try and retake it.
That was the theory anyway.
However it failed to materialize in practice mainly due to a lack of adequate mass.
Lapitus simply did not the number, for if he had wanted to make taking the wall as hard as possible for Alexander, he should have deployed infantry on the walls, along with those archers from the top.