Whiff and Wibble wording

Here is something I don't dig in the description of the Wibbles' special abilities:
"When a creature makes a non-spell attack against a wibble and rolls a natural 1–2, 1d3 new wibbles are created in the same area."

13th Age Bestiary says, wibbles are created in the areas of magic (especially, aracne) fumbles, so why non-spell?
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