Ron is walking down the sidewalk, not paying attention to where he is going. He runs into Ruby who is carrying a large sack of groceries. The groceries spill into the sidewalk, two blocks away buds slips on an apple which had rolled down the sidewalk and falls into the street as a result, Jim, driving his pick up truck down the street swerves to avoid bud as a result. Jim hits a car driven by Nadine in the accident Nadines's antique flower vase in which she carries flowers to her sick. Grandmother is completely shattered and Nadine's suit against Ron for negligence what is the weakest element of her case