when you pull, does Blade pulls free of the sheath or does it all come out?
It depends there are three different way to access the knife. You can pull knife and sheath out at the same time. Pop the handle clear of the sheath and the knife will come out leaving the sheath behind like a Katana.
The third way is to use a static line attached to your belt this automatically strips the sheath off at a predetermined point during the draw. The static line draw is good if your concerned about cutting your clothes on the draw.
If you want to belt carry then it only takes a couple of minutes to R&R.
This style of carry was common with 19th century bowies.