I've never liked this action. It takes your entire turn and only moves you a little way away from your opponent. All this does is give them an opportunity to get a charge bonus on you next turn. The only time it is actually useful is in multiple combats or if you can step through a door way and somehow close the door behind you.
This tweak doesn't change much, but I think it helps make a Disengage more useful. If you successfully Disengage from your opponent they lose a 1/2 action in their next turn as your defensive attacks put them on the back foot.
This gives you a small chance of escaping rather than just putting you out the open waiting to get an axe in the back.
Hellebore