Probably because being engulfed by chaos would present problems of knowing what to hit to destroy it.
Then again it doesn't actually get destroyed, it merely leaves the material world. So any hero trying this would go with it unless there's a way out.
Which leads on to bat droppings - does the Bat leave patches of chaos all over the world? If so I reckon there's a big patch right outside WW for most of the seige if not longer.
-- Donald Oddy http://www.grove.demon.co.uk/
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