This might be explained due to the fact that web isn't a direct damage spell, more a disabeling spell. They probably will not go hostile untill you attack them. Try entangle and see if it has the same affect.
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JR<p>Damned i lost cousin Jan\'s techno gloves<p>Forest runner and first gnomish demiranger-protector with slightly rougueish tendencies and a natural dislike for Aerie
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