I first noticed this killing snakes in EC on Red. The darkweeds would try to pierce me. I said to myself, "self, this is wrong".
Much like the change to shaman pets, we should not have dragons or other NPCs that don't show a weapon wielding or even dual wielding them and therefore should not be proc'ing them.
http://www.legacyofsteel.net/Archives/Post/2001-01-08
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If you examine the Legacy of Steel link, you'll see this Hoshkar had a Sword of the Shissar on him and was NOT slashing with it.
This creates extremely brutal scenarios given a certain spawn. Then again also if some mobs are charmed they would be able to incorrectly dual wield and proc weapons.
Further, and I am looking for the proof of this: summoned pets and npcs should be able to dual wield 2 handers. I clearly remember handing a friend's necro pet in Oasis dual scythes many times on live and that working. Stay tuned.