[2019] The Assassin's 3.8 Changes Overview (reup)

Originally posted by Palsteron

I am curious about how the new Opportunistic works exactly. It says: "20% more Damage while there is at most one Rare or Unique Enemy nearby"

Does that mean 0 unique enemies nearby would also trigger the effect? It wouldn't make sense from a flavour or balance perspective, the wording just seems a little odd to me.