Does the hospital liaison committee take it upon themselves to visit you in the hospital and talk to your doctors as soon as they hear you're sick, or do they wait for an invite? I'm guessing the first one.
I imagine they take it upon themselves to visit "out of concern" but then put the screw to the JW patient to gather private medical information on the patient's diagnosis, treatment options, etc. Then I suspect they "suggest" to the patient to "alllow" them to speak on his/her behalf to the medical staff regarding his/her firm decision to refuse blood. I'm sure they also are carrying blank blood cards/DPAs for the JW patient to fill out (in their presence) just in case the JW patient had "forgotten" to have one completed (or "misplaced" it) before their arrival.