That's the thing - I don't know. I can rule out another mind, because I know what that feels like. One minute I was fine. And the next was - [A visible look of discomfort crosses his face as he tries to remember.] The world felt like it was tilting. I wasn't sure if I was dying or going insane.

[That's dreamshit for you. But the second part of what Javik says sees him snap his head up.]

I know of something like that. [He's thinking of Hermione's pensive. The problem being that it makes copies of memories, rather than takes them away completely. Surely they could at least try to alter it.] It's not exactly what you describe, but it's a start.