Crystal Martin

Its something different and its an all around great movie! The ending i simply dont understand though... Since Julia was actually dead all along, why are the other two with her and suddenly sucked back to reality of their strangled bodies lying dead on the floor? Or, was that a dream? I need to know why it ended as it did and why the words such as once it pulls you to the other side..... Like i dont get it. Were they dead all along all three of them?