Use the draft action to draft the currently viewing post, page or custom post type. When the post is already a draft this command will simply save the post (you can also use the Save command). When the post status is anything else it will change the post status to draft and save it.

Using this command on the admin/edit screen it will save and refresh the page as if you were regularly save the post as a draft.

On the front-end the page status will be updated on the background, the page wil not automatically refresh (no real need, is there?).