It was never about the woman but rather forsaking God.
This they said, tempting him, that they might have to accuse him. But Jesus stooped down, and with his finger wrote on the ground, as though he heard them not. So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her.And again he stooped down, and wrote on the ground.And they which heard it, being "convicted by their own conscience", went out one by one, beginning at the eldest, even unto the last: and Jesus was left alone, and the woman standing in the midst. Joh 8:6
I think "Where is the man?" is a good point in that parable. But stooping to the ground and writing on the ground, the lifeless, spiritless dust man was formed of was more the subject matter.
Twice he performed that before it seems the older and possibly more familiar with the scriptures in Jeremiah 17 left first, the younger following the older rather than following Christ .
It I think represented the fingerprints like in cement for the Hollywood movie stars as their own claim of fame. . They were convicted by their conscience or heart of natural man .Not a work of the Holy Spirit.
Their hearts remained hard not mixing faith in what they did hear and see as a witness against them .
The heart is deceitful above all things, and desperately wicked: who can know it? I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.As the partridge sitteth on eggs, and hatcheth them not; so he that getteth riches, and not by right, shall leave them in the midst of his days, and at his end shall be a fool.A glorious high throne from the beginning is the place of our sanctuary.O LORD, the hope of Israel, all that forsake thee shall be ashamed, and they that depart from me "shall be written in the earth", because they have forsaken the LORD, the fountain of living waters.