Lamar has a duty to win the race because he was hired by someone. When someone hires you for a specific task, like winning a race, it creates an obligation to fulfill that task to the best of your abilities. Lamar's duty is tied to the expectations of the hiring party, who likely wants him to achieve victory.
Lamar's duty to win the race stems from being hired by someone. When you're hired for a task, it creates a responsibility to fulfill that task. In this case, Lamar's duty is directly connected to the expectations of the hiring party, who likely wants him to secure a victory. It's like a contractual obligation to perform at his best and achieve the desired outcome.