Zach nodded, satisfied with the boat metaphor; that, he could understand, though he wondered if it was the absence of Albus's mind in his that had him so unsteady, or if it had more to do with what he had done in there, what he had changed. Now that he thought about it, Zach didn't know what had changed, precisely. The impression of a difference between the then and the now was dulling gradually, and soon, he knew he wouldn't be aware of it at all.
"Lysander was the man who unlocked the memories for me," Zach answered, blinking slowly. It really was like being drunk and having just woken up, all at once. "I was... ill, like this, and I had nightmares. I would wake up screaming in the middle of the night and not remember why, but the fear stayed with me. Sometimes, I would wake up paralysed, seeing a man - Gellert Grindelwald - standing above me. I would hear him say the things he said, and tell me to do the things he made me do. Sometimes I would see myself above my bed with a knife in my hand, stabbing myself, cutting into myself. And then seconds later, I wouldn't remember a thing. It was... terrifying. For Cedric, too. My- my boyfriend. He..." Zach shook his head. That wasn't the question. "Lysander unlocked the memories for me, so that I at least knew why this was all happening, since it was happening anyway. And he said, before he left, that it was as though my brain were fibrillating. Not actually shaking around in my head, but... that it wasn't working properly, that it was misfiring and not firing when it was meant to, and that it needed a shock to... stop it. But this doesn't feel like a shock, it feels like... like a woolen blindfold. But that I see through more clearly than I've ever seen before."