Huh? Is that how it works?

[Kaz looked genuinely puzzled - he was obviously under the impression that melting sand just magically created glass instantaneously]

But, when lightning strikes, it turns to glass immediately. Wouldn't it do the same thing? Like, if I make it super hot, then - super cold! Then it'd skip the molten part and just turn into glass, right?

[...]

Or maybe it only does that with lightning. So... no belfire, just one concentrated Ziodyne! [No, wait-] Ah, but that might kill someone if it goes wrong. Lightning and molten sand flying everywhere...