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It would normally be in the one Writ. The reason the employer could be liable is that under Scots law an employer can be found vicariously liable for the negligent actings of its employee acting in the course of employment. So it's the same as a personal injury sustained at work: the employer can be liable if the employee caused injury to another person.
This link might help: http://m.acas.org.uk/index.aspx?articleid=3715