What do Hannibal do with everyone he didn't kill in the Greek city?

He was called the "father of strategy." He was even admired by his enemies, Cornelius Nepote baptized him as "the greatest of the generals" in fact, his greatest enemy, Rome, adapted certain elements of his military tactics to his own strategic heritage.

Explanation:

Hannibal; the great commander who divided the dangers of war with his warriors. He never ordered others to do what he could not do personally. This only gained him considerable authority both among the Carthaginian army and among enemy soldiers.

This is the greatest strategist of his time, an important contribution to the development of world military art. His ability to competently characterize the military-political situation, carefully organize reconnaissance, take care of the army's rearguard, supply bases, in-depth study of the theater of military operations, and ensure the long transitions of his troops were also very appreciated by modern historians. I train many of their captives for war.

Hannibal as a great war strategist tried his best not to kill people because it was never his intention to do so. He never had any strategy during the war other than to see to the fall of Rome.

For those that he didn't kill in the greek city, he took them with him when leaving the city.