Which of the following Supreme Court cases ruled that issues relating to deadly force must be judged from the standpoint of a reasonable officer. For instance, if an officer was approached in a threatening manner by an assailant wielding a knife … and the assailant failed to stop when warned and was killed by the officer … and it turned out that the assailant was deaf. The officer would not be held liable if he had no way of knowing about the disability according to this Supreme Court case: