RESURRECTING BELOW THE DEATH LINE:
There is an invisible line on the vertical axis of every WoW zone. Explorers call this the "death line". If you go below it, you hear a "whoosh" sound, your camera stays put while your character plummets, and you die. If you land on the ground below that line and can be resurrected, you come back to life in a sort of offline mode. Your camera still wants to stay high (and often does), but you can run around below the death line and explore large areas that were previously impossible to reach.