We see Cobb being stabbed by Mal in 4th level of dream (which is presumably limbo); does that give him a shock to rise up to the third, then to the second, and ultimately to the first level (where he dies due to drowning)?
Or does he die due to that stab? If yes, then what happens to a person who dies in limbo?
PS: I just remembered that a death in limbo would wake up a person all the way to the reality.
Now a stab wouldn't really have acted as a kick. Cobb would have needed a synchronised kick due to the strong sedative. So we can rule out the stab being a kick. Which implies that the stab killed Dom and then he should be back to reality, without getting a chance to find Saito and rescue him.
So what is the part I am missing?