steveportee wrote:It's probably the most unclear section of the entire film. The rule is set up that a kick comes from the level above you. For Fischer, the kick from above is him getting shocked by the defibrillator. For Ariadne, it's the collapsing of the snow fortress.
However, when Eames initially sets up the defibrillator on Fischer, Cobb says that it's no use, his mind is already trapped down there. So it seems to indicate that the kick from the level above isn't enough by itself, and that they also need a kick from below.
And I don't think that Ariadne died in Limbo to wake up, because she was still sedated, and dying when sedated won't wake someone up. That's why I think she woke up from the kick.
Fischer wakes up from Limbo by falling off the building which is synchronized with the defibrillator.
Ariadne wakes up from Limbo by falling off the building which is synchronized with the explosion in the hospital layer.
The rest of the layers are synchronized with everyone -- hospital explosion, elevator explosion & Van hitting the water.