The coffee enema is what causes the liver ducts to dilate. It's action of the caffeine in the coffee (this is a low sigmoid colon retention enema) thru the hemorrhoidal veins up thru the portal vein to the liver.
Doing a liver flush w/o something that will allow the bile duct to relax is supremely risky. Stones can get caught in the bile duct cauing a gall bladder attack. That IS the definition of a gall bladder attack or what happens when one occurs.