The BODY NND must kill the victim before the Transform can fully take effect. Once the victim dies, the Transform will cause the victim to rise as a zombie in about 2-3 hours.
The Hunting Moan uses the idea of "voice range" from The Ultimate Energy Projector (page 30). Thus, people within the Area of Effect might not hear the moan (and be affected) in certain situations. Also, GMs may declare that there need to be a set number of zombies before the moan really takes effect (i.e. 5 or more). In addition, the GM may declare the effects of the Hunting Moan stack. Meaning that 5 zombies equals 1 point of PRE Drain, while 10 equals 1/2d6, 20 equals 1d6, and so on, with each doubling of zombie numbers adding a Damage Class.