No one wants to take a stab at what the fault current will be in the scenario I described above?
Assuming the human body has approximately 1,200 to 1,500 ohms hand-to-hand resistance (with moist hands) and 120 volts AC exists between the current source (nicked wire) and sink (grounded chain link fence) then there will be around 80 mA to 100 mA fault current through the victim in such a scenario. Just 10 mA of current is a very painful shock. 20 mA is enough to overcome your hand release reflex so you can't let go of an energized wire. And 30 mA for more a few seconds is considered to be enough to cause ventricular fibrillation in a large portion of the population with old people and young kids being most at risk. Without intervention with a defibrillator, you could be dead in minutes depending on your heart condition to begin with. An 80 to 100 mA hand-to-hand or hand-to-foot shock for more than a few seconds is considered lethal in most cases. A lot of the danger depends on if the fault current travels through the chest cavity or not, so a finger-to-finger shock on one hand is not dangerous to the heart, but if sustained long enough will cause long-term nerve damage in the hand.
So no, a human's internal body resistance won't produce enough fault current to trip even a 15 amp circuit breaker.
The over-current circuit breakers in a generator, or any other service panel, are only there to protect the downstream wiring from overloading and heating up enough to cause a fire. They are NOT there to protect your gear from over-current damage (that's the job of the internal fuse) and certainly not there to protect a human from being electrocuted.
On the other hand, The 6 mA trip point of a standard domestic GFCI has been designed to stop any high-resistance shock that approaches danger levels, even for sustained contact. There are commercial/industrial GFCIs that have adjustable threshold points up to 30 mA, which is right at the level of lethality for sustained contact. These were originally designed for mines and such that had a lot of moisture in the motors that would trip a 6 mA breaker too often. Of course, a low-impedance fault of an ohm or so (typical stage wiring) will produce up to 100 amps of fault current which should clear any stage breakers. Of course, once you get to camlock current levels of 100 or more amps, then arc flash danger becomes the main concern. I believe that all personnel handling potentially live camlocks should be wearing PPE gear because the resultant arc flash of a 200 amp camlock connecting to a cable that was shorted to the same fence could produce a significant fireball that would be very dangerous even from several feet away. So for low-voltage hookups (under 600 to 1,000 volts as defined by the NFPA) the arc flash energy available must be closely monitored.
