How does an unarmed attack trigger this? Does every unarmed attack that connects cause disorientation?

How does an unarmed attack trigger this? Does every unarmed attack that connects cause disorientation?

As an Active quality, you need to spend two Advantages or a Triumph to activate it.

You activate it just like any other weapon quality: spending Advantages.

Aha! Thanks!

p,211 EoE CRB discusses open hand attack effects.