Corrected entry: When the velociraptor entering the park attacks the "gatekeeper," the staff use tasers to get it to stop. These tasers probably operate at a high voltage and possibly more amps. In reality, the gatekeeper and Robert Muldoon would be dead since they would've received the same shock or lower. Humans can die at 200 milliamperes (0.2 amps), which is probably what would've happened to Robert and the worker, if the velociraptor didn't kill him.
Matdan97
3rd Nov 2017
Correction: Electricity takes the shortest route to ground. That would be through the raptor and not through the gatekeeper. Additionally, you are making assumptions about the stun batons they are using.