Two workers with a history of friction between them got into an argument. Later, while the co-worker was using the jointer, the worker threw a heavy piece of wood in his direction, hitting him in the legs. The company fired the worker. But an arbitrator ordered his reinstatement. The arbitrator concluded that the worker hadn’t intended to hit the co-worker with the wood. But by throwing wood around, he committed a serious safety infraction and was careless about the potential consequences of his actions, especially when the co-worker was using dangerous machinery at the time. However, the worker didn’t have a history of violence and acknowledged the seriousness of his misconduct. So the arbitrator concluded that a “significant suspension” was appropriate discipline [BC Door Co. v. United Steel, Paper and Forestry, Rubber, Manufacturing Energy Allied Industrial and Services Workers International Union, Local 1-1937 (Boston Grievance),  B.C.C.A.A.A. No. 99, July 28, 2011].