Bob, a driver for City Delivery Company, carelessly leaves the truck's motor running while he makes a delivery. The transmission engages and the truck 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, and injures a bystander, Carol. Is Bob liable? If so, under what legal theory? Be sure to use IRAC when responding.