How to test murder:
Leave 2 points untalented -> find dragon / human / watever fits with 0 armor -> cast kick -> check damage (should be 80) -> spec 2/2 murder -> kick again -> profit
To realize how feint works you guys need to understand how threat works!
Threat is a flat number u do to the boss as u do damage/healing...
When you do 1k damage without any threat modifiers(blessing of salvation, tranq totem, talents) you will do 1k threat also... When the character with aggro on the boss gets beaten in threat done by a certain percentage (unsure about vanilla values) then the aggro goes to the guy "overagroing". To get back the aggro from the boss the tank needs to beat the new "MT" by a certain percentage again... So after you did 50k threat on the boss and tank did 50k also if you overagro by jumping to 55k then -500 threat from feint will usually not remove the aggro from you, death however will do so...

The original retail feint did -650 threat iirc, and ours does -500 approx... I am unsure of these values however and they need to be reconfirmed, as the guy that did the original testing did this "many months ago"