How did jack break danny's arm in the shining?

In Stephen King's "The Shining," Jack Torrance breaks his son Danny's arm as a result of a violent outburst fueled by his growing madness and the influence of the Overlook Hotel. During a moment of rage, he accidentally injures Danny while trying to assert control over him. The incident symbolizes the deterioration of Jack's mental state and the tragic consequences of his inability to cope with his own demons. This event is pivotal in illustrating the destructive impact of the hotel on Jack and his family.