It's all in the NAZA-M manual peeps. Unfortunately DJI doesn't place a link to it in the download sections of the P2 models. Everyone should grab it from one of the P1 models download sections and read it from beginning to end and back.
http://download.dji-innovations.com/dow ... .26_en.pdf
On page 10 about the intelligent mode to stop motors in which almost everyone will be flying:
(1) If you choose the Intelligent mode, and the throttle stick is under 10%, this will trigger the landing Procedure, in any control mode. In this judgment, pitch, roll and yaw controls are denied except the throttle, but multi-rotor will still auto level.
So the Phantom will enter Autoland Mode when you pull the throttle all the way down in flight. I experienced it once when I was descending fast when flying at max horizontal speed and so no risk of VRS. I allowed myself to pull hard on the throttle and suddenly it stopped its horizontal motion and started to descend vertically while I was still giving full right stick. I then remembered this feature.
It should actually be a way to avoid VRS by descending too fast as the Autoland descent speed will be safe. People could deliberately use it to this end.