Not familar with the specifics of the Husky fork, but you need to hold the damper rod from the inside.
Usually there is a special tool for this. However, you may be able to make one. My buddy made one once using an aluminum tube from a vacuum cleaner extension. He notched the end of the tube to match up with two tabs located at the base of the damper rod.
Shine a strong light down in there and take a look. You might be able to improvise a tool to hold it while you loosen the bolt.
If you can't figure out a way to hold the rod from the inside and you can't find the correct tool, you might try heating up the bolt and then use your impact wrench again.