If it still has a viable root with more on the way, I'd just keep it shadier and if you can, a little more humid. i.e. if you have a humidifier, closer to it. I wouldn't stick it in a bag--that's more for the rootless.
as brittle as parvi roots can be, *brachy* roots take the cake. you have to have a real pair of soft hands when potting brachys. people have killed big mature plants because all the fat healthy roots broke off at the base.