Where security guards assault a patron after removing them from premises, the dominant cause of the assault — not merely its severity — determines whether the employer is vicariously liable. Three factors may indicate the assault was done in the course of employment rather than as an independent act: (1) restraint shown by the guards before the assault despite provocation, (2) statements by the guards after the assault indicating it was done to prevent further trouble, and (3) coordinated conduct by multiple guards suggesting a planned course of action rather than a spontaneous act of personal animosity. The severity of the assault alone does not determine the issue.
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