“In cases of personal injury, it suffices that the activity of the defendant has given rise to the situation which has caused the injury to the plaintiff. Where the defendant is involved in an activity which, if he is not careful, will create a foreseeable risk of personal injury to others, the defendant owes a duty of care to those others to act reasonably having regard to the existence of that risk. The limiting factors are the concepts of foreseeability and reasonableness.”
“Where the plaintiff belongs to a class which either is or ought to be within the contemplation of the defendant and the defendant by reason of his involvement in an activity which gives him a measure of control over and responsibility for a situation which, if dangerous, will be liable to injure the plaintiff, the defendant is liable if as a result of his unreasonable lack of care he causes a situation to exist which does in fact cause the plaintiff injury.”