Through the Pensieve, Cypher witnessed everything that had happened after he fell unconscious from Professor Dumbledore's perspective.
He also understood why Professor Dumbledore had become the way he was now.
The wizarding world's foremost figures all believed that if Dumbledore wanted to stop Grindelwald, he had to destroy the Blood Oath between them.
Only then could Dumbledore cast spells against Grindelwald.
But that was not the truth.
The Blood Oath was a vow that neither of them would ever betray the other.
Dumbledore had no intention of betraying Grindelwald. He wanted to save him.
In that case, Dumbledore could cast spells on Grindelwald without destroying the Blood Oath.
Even so, that was merely the most obvious function of the Blood Oath—the two of them would never betray each other.
The Blood Oath had a deeper purpose: it connected two people who shared no blood relation.
In other words, before divination, curses, prophecies, and even... fate-based magic.
By activating the Blood Oath through special means, Dumbledore and Grindelwald could be regarded as the same person.
And Professor Dumbledore had now linked his fate to Grindelwald's through the Blood Oath.
Yet he alone bore the threads of both their destinies.
Especially when it had just suffered a severe blow, its attention would neither be nor could be focused on Dumbledore.
That was why Dumbledore could, with Nicolas Flamel's help, maintain the binding of fate for such a long time.
Even then, fate's passive backlash and drain left Dumbledore in unbearable misery.
In the end, he had no choice but to enter a state of suspended death, reducing the backlash and drain to their lowest point.
As for why Dumbledore had done this, it was because this was Grindelwald's rare chance at "freedom."
With his magical attainments and strategic insight, he could arrange