Porters can teleport vast distances by willing to be elsewhere.
By nature, Porters have a subconcious understanding of the invisible ties of the universe. This unrealized instinct is responsible for many psychic powers, and is greatly expressed in Porters. All they need to do is just "want to be somewhere else". It is a relatively unstable power at first, but becomes a breeze given enough practice.
Eventually Porters could develop their power to transport other people as well.