Simple formula, actually.
The Watchtower Society is a mere conduit (mouthpiece) for God.
God shouts through this megaphone and we get the message through the publications.
The bible is "sourced" as a back-up...but...it is the Governing Body of mouthpieces who nudge meaning out of scripture.
The bible isn't written for non-anointed.
Non-anointed (the majority of JW's) are like dogs begging scraps from the table of the anointed.
Oddly, not all the anointed are mouthpieces!
Most of the anointed must beg at the table of the super-anointed (faithful and discreet slave.)
The bible was actually written, then, for the super-anointed.
The Super-Anointed make educated guesses and pass them along as policy.
To play the game everybody must accept without reservation these guesses AS THOUGH they were words spoken by Jehovah.
When they prove false, wrong or otherwise stupid and impracticable (as they always do) they are changed.
All the begging dogs at the table have to yak up the wad of crud and vomit it out.
This was....momentarily..."food at the proper time."
So, when it comes to blood issues the "food at the proper time" often becomes dog yak.
A begging dog who will not go off and find its own damned food has no business whining about what his master throws on the floor
for it to wolf down!
Just read the Watchtower, shut up and eat your yak!