The day after Seller completed the sale of his house and moved out, one of the slates flew off the roof during a windstorm. The slate struck Pedestrian, who was on the public sidewalk. Pedestrian was seriously injured. The roof is old and has lost several slates in ordinary windstorms on other occasions. If Pedestrian sues Seller to recover damages for his injuries, will Pedestrian prevail? 
Yes, because the roof was defective when Seller sold the house.  Yes, if Seller should have been aware of the condition of the roof and should have realized that it was dangerous to persons outside the premises.  No, because Seller was neither the owner nor the occupier of the house when Pedestrian was injured.  No, if Pedestrian knew that in the past slates had blown off the roof during windstorms. 