There are a number of ways a person can be driven mad.

You can tear the foundation of their world out from under them, and tear the sky open above them after that. Kevin Regnard's world rocked and heaved the day his master's family was killed. The sky ripped open shortly afterwards and his body was taken over. He'd given his consent, of course, drank the monster's blood of his own free will… but the possession had sealed his fate in a way nothing else could. It was intimate and strange, it felt a little like being hollowed out with a sharp spoon to make room for something else in his chest. Sometimes he wants to mourn for the parts of himself that used to be where Albus rests now.

The tears won't come. Maybe one of the things his knife-edge chain carved out of his insides was his ability to weep. As he lies in the dark that last night, he's grateful. If he were crying they'd hear him and come for him, and then it would all be for nothing.

Yes, lying in the dark, trying to smother the sound of his own breathing, listening to the floorboards creak above him, Kevin Regnard is aware that he has lost a great deal. He is aware that he has been driven mad.

Now it's too late. The hand on the seal moves, and he forgets his silence and screams. Albus roars in rage, and his world goes out from under him one last time. He feels himself falling.

That's how this part of the story ends. It's time to go back to the beginning.