Unless you can only provoke if you "use a power." Are basic ranged attacks "powers"? Because they certainly provoke.
"A basic attack is an at-will power that everyone possesses, regardless of class." PHB pg 287 Below that they give power blocks for both Melee and Ranged Basic Attacks just like the class powers.
Now, I don't have my book here, but I was under the impression that making a ranged attack, as one does when one sustains flaming sphere, provokes.
This is incorrect. Pg 290 defines the general things that provoke (other specific rules override this), and it states:
- "If an enemy leaves a square adjacent to you, you can make an opportunity attack against that enemy."
- "In an enemy adjacent to you uses a ranged power or an area power, you can make an opportunity attack against that enemy."
It says more than that, but those are the exact actions that provoke an attack.
Which brought use to the definition of the word "use", which the last several posts have been about.