Can You Sharpen A Knife On Another Knife?

Everyone has seen the knife sharpening hacks on youtube. Does sharpening a knife, on another knife actually work?? Will It ruin your knife? Its time to give the mother of all knife sharpening hacks a try and see for myself if it is a viable option in a dire situation.

I do know my way around knife sharpening.
If you want to learn how to sharpen a knife check out my other videos😀

For this knife hack to be confirmed, ANY knife, should be able to be sharpened, on ANY knife. I realize both of these knife steels are the same. I suppose theres a chance you could sharpen a knife better, (not likely) if the knife your sharpening on, is made of harder steel. There is ZERO grit to sharpen the back a knife.

The two knives I used:
The knife sharpened http://amzn.to/2h52jkP
The knife I used to sharpen on (sharp knife at the end) http://amzn.to/2yLFwSD
Knife I used to cut cardboard http://amzn.to/2y3HHPx
My camera http://amzn.to/2h49LMP
Sound recorder http://amzn.to/2zzR4rk

Music from epidemic sound