Instant Respawn Farm, Primal Shadow - Unknown (Patreon)

I have not heard not seen or heard mention of this farm before on youtube or any website/forum. I'd appreciate a correction if a guide does exist.

On Void Ridge in Hellfire Peninsula, Outland there are a number of Vaccillating Voidwalkers and Collapsing Voidwalker mobs. These each drop 1-2 Motes Of Shadow, nine of which can be turned into Primal Shadow. Primal Shadow sells for around 280 gold on the Auction House.

These mobs can be turned into an instant respawn farm with a group or multiboxing, the method isn't obvious, which means that if you know the technique you can obtain the primals faster than any one else can. 

All farming characters must stay out of the energy pool area for this method to attack and attack from range. Entering the energy pool area slows down the respawn so you will need a loot-a-rang or other remote looting ability such as hunter fetch (I learned about this method from a multi-boxing hunter). Pets do not prevent respawn.

All four energy pools must be camped for instantaneous respawn to occur.

The profit from this farm expressed in terms of the average value of each primal shadow is very high-well over 50,000 gold an hour. Is it reallistic to be able to sell a high volume of the material? Probably not except possibly on a very high population server, but it does sell regularly in smaller quantities.