Hello guys!
This bug works 100% with me and it is really awesome!
How To:
1. You must have Dual Spec.
2. One of your talent is frost and has 2 points on Improved Frost Presence
3. Get on your other talent whatever it is and put Frost Presence on, and then activate the frost talent and change to blood presence or unholy presence and then return back to the other talent and you will notice that you will get frost presence + HP without being on Frost presence!!
On my PvP gear i have 28k unbuffed at blood presence and with this bug now i have 30k unbuffed!
GL doing it and have fun!