Wind walk and collision

Wind walk and collision

Recently, I have found that turning collision off allows a unit to move through trees and over cliffs (if you do persistent clicking and Shift+M)

However, when I try to trigger this with wind walk, it doesnt work and the unit can't/won't do things most units with their collision off can do.

Basically, I made a trigger to turn off collision when he begins the effect of the wind walk ability.

Do you have any idea what might be wrong?

dude, i think that there where it says that even if collision is 0 unit will be and obstacle for itself u got the answer. So the only way to do this is to make an metamorphosis which turns u into flyin' unit.