"I'm not sure either.. I think it has to do something with the void."

But Madoka has never been really great with technical or scientific details, so she can't really give a better explanation than that. The void just makes you feel weird if you stare at it for too long because it just does - that's all she knows.

At least she does have the good graces to slowly add to it: ".. It's a little strange, isn't it?"

Though a lot of things here on the train are strange. Especially if you're new, though that's a long time ago for her.