We don't know how we're all here in the first place, still. It didn't sound like that was tech that they had in this era.

But we already know that they can pull things from our minds and make us hallucinate. It makes the most sense that's what's happening. Whether it's this 'beast' behind the scenes, looking to do us harm, or whether it's the nanomachines malfunctioning. Might be a bit of both.

[ Once again, they were reaching the edges of what they knew for sure, and it was so frustrating. Too much of this was unknown. Sylar grunts a complaint as he thought over it all again. ]