Where common employment brings two workers together and a confrontation occurs that would probably not have occurred absent the common employment, the employment can be a 'substantial contributing factor' to the resulting injury under s 9A of the Workers Compensation Act 1987 (NSW), regardless of whether the aggressor's motivation was related to employment. The source of the aggressor's grievance does not need to be employment-related. An erroneous determination of a question of fact by a Deputy President under s 352(5) does not constitute an error 'in point of law' for the purposes of appeal under s 353.
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