Guild Wars 2

I got a question. I already have the jump from the top of the tower feat, what exactly do they mean by jump from the exterior of the tower?

Do the boss instance, then after finishing it don’t leave through the little “door” icon. Instead walk through a portal that is basically the back door of the boss instance. You will find yourself outside of the tower. The goggles are on a wooden beam in front of you.

Thank you for the info.