Can not so fast counter an enemy not so fast that targets an ability?

Question

Accepted Answer

No, you cannot use **Not So Fast** to counter an opponent's **Not So Fast**.

According to **RiftJudge FAQ (ID 4968)**:
> "Ruling: No, you cannot use Not So Fast to counter another Not So Fast. Not So Fast targets spells and abilities, not units or gear, so it cannot be a legal target for another Not So Fast."

### Reasoning:
*   **Targeting Requirement:** *Not So Fast* specifically requires that the spell or ability it counters must be choosing a **unit or gear** that is friendly to you.
*   **Invalid Target:** Because *Not So Fast* is a spell that targets another spell (or ability), it does not meet the requirement of targeting a unit or gear. Therefore, it is not a legal target for another *Not So Fast*.