"̢̀͡ I guess there was never a way around this moment after all... Time to cut out the disease and end your sickness for good, before you do something irreversible. "̸̶̴͠
Martin reached into his brother's mind, as he had done so many times before. He carelessly pushed aside what was left of the defenses and scanned every spark and every node. An immense calculation, a fraction a second later, he had mapped every synapse dedicated to housing Stein. As expected, the living memory had grown, and was actively pressing down on his brothers auditory and emotional systems.
With a simple command all of it, every memory Stein had, every plan he'd concocted and every secret he'd kept. All of it was erased from Mithias's mind.
Replaced by the first thing Martin encountered in his network, an extensive knowledge on psychology, copied from a few psych students in Toronto.

But there was one problem, Martin couldn't make himself destroy something like this. Such potential couldn't be wasted.
So against his better judgement he took the data he'd stolen from Mithias and implanted it into the body of a comatose human child on the west coast.
Taking care to attach all the strings in the right places he used the being called Stein to repair the long lost brain of the kid.
Soon the Titan Mind would arise in a hospital bed far from here, with just vague memories of his former life and two loving parents by his 6 year old side.
His clearest memory would be the voice of Martin echo trough his head.
[b]"̢̀͡ You have been given some decades to reflect on your plans, and understand why you were wrong. I shall give you one hint, learn the difference between angels and monsters. "̸̶̴͠[/b]

Martin then returned his attention to Terebithia.
By grace of his foresight in removing the AI's ability to perceive him he slipped into the massively expanding mind.
With a metaphorical finger on the off-switch he did nothing yet, he waited and watched. He wanted to see these so called angels he'd seen in Stein's mind.