Breaking things and burning hot skin doesn't sound like a good combination to Ned. He doesn't know what Charlie might be like in normal life (he doesn't always keep up with what's going on on the network), but from the sounds of it, the transformation as turned him into something rather nasty.

The hour of the night, Meyer's unguardedness, and his lingering feeling of light-headedness all combine to make Ned feel rather conspiratorial, rather talkative.

"Why would he be mad that you're a vampire?" That is the bit that Ned doesn't understand, "Especially if he turned into some kind of... anger spirit or heat monster or whatever. He has to know it's not your fault, right?"