Dead Battery

[Sijray21]

You are starting off the secondary battery, not the first. The jumper cables hook directly to the battery cables thus providing voltage to the system just like the actual battery would. You are hooking them up in parallel not series.

I know how to jumpstart a car....

If the battery is so dead that it wont hold any charge at all, it wont even work to start the car off a secondary charge. The resistance is too high interally.

isn't the starter of the dead-battery car physically connected to jumper cables and is running off the circuit from the second car? therefore negating the dead battery's need in the circuit.