A girl on the basketball team which Jack coaches sustains a serious injury during a game, leaving him to feel guilty; Drs. Austin and Yeats work together on a case of a man with heart disease and Alzheimer's, and disagree on a course of treatment that causes Kate a lot of agitation; Keith reluctantly agrees to let his son see Aaron to talk about the shooting, but is actively hostile to therapy... for either of them; Dr. Catera's assistant tries to spread holiday cheer a little too vigorously.