Dan a driver for EZ Delivery Company, leaves the truck motor running in neutral and carelessly forgets to set the parking brake while he makes 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 collapse onto a crane which falls on, and injures, a bystander, what must Flo show to recover damages from Dan? What tort has Dan commited?