Mrs. Kauffman was riding up the escalator owned by the Toronto Transit Commission (TTC). The escalator was equipped with a metal-clad handrail instead of the rubber type, which presumably would have been less slippery. Three young men, riding the same escalator just above Kauffman, began pushing each other around. They ultimately fell on Kauffman, knocking her over and severely injuring her. Kauffman sued the TTC for damages, claiming that it had been negligent in installing an untested handrail made of metal which offered less support and that is why she fell. Apply the principles of tort law to this situation. Suggest a result.