Business Tort of Negligence

Dewayne, a driver for Speedy Delivery Company, leaves the truck's motor running in neutral and carelessly forgets to set the parking brake while making a delivery. The truck rolls and crashes into a nearby gas station pump, igniting a fire that spreads quickly to a construction site a block away. A burned wall collapses onto a crane, which falls on Fazio, a bystander, and injures him.

What must Fazio show to recover damages from Speedy Delivery? If you are the attorney for Speedy Delivery what would be your best defense argument?

list references, please :)