Reference DocumentClass var from within MovieClips Timeline

I didn’t know how else to say it. In My DocumentClass, I have a public variable “canMove”. In this class I created an instance of “fighter” which is a child of the stage. Now, how could I acess “canMove” from within the timeline of “fighter”? I will provied more information if necessary. some searching reveals something like MovieClip(parent).varName or something but I just cant figure it out.

EDIT: I just want to set the public var “canMove” to false