In Canada, the "for the purpose of saving human life" carries a lot of weight. My experience has been that Transport Canada generally defends the actions of a pilot who deviated from the regulations for the purpose of saving human life. I would not expect Transport Canada to give a private landowner much traction in such a situation, unless "wreckless operation" of the rescuing aircraft was apparent.
One of several references exemptions from regulation for saving human life can be seen here:
(2) A person may conduct a take-off or landing in an aircraft within a built-up area of a city or town at a place that is not located at an airport, heliport or a military aerodrome where
(amended 2007/06/30;
previous version)
(a) the place is not set apart for the operation of aircraft;
(b) the flight is conducted without creating a hazard to persons or property on the surface; and
(c) the aircraft is operated
(i) for the purpose of a police operation that is conducted in the service of a police authority, or
(ii) for the purpose of saving human life.