Rush’s Pasta & Pizza employs Sigfried as a delivery driver. Rush’s guarantees that an order will be delivered within thirty minutes or there is no charge, and insists that its drivers meet the limit. One night, while making a delivery, Sigfried is caught in a traffic jam. To deliver the order within the thirty-minute time limit, Sigfried drives onto a sidewalk and hits Tanya, a pedestrian. Is Rush liable to Tanya for her injuries? Is Sigfried liable to Tanya? Why or why not?