Gord Brandt, a famed falcon Biologist out in Alberta has written some interesting articles, his last one discussed 'locations' and he mentioned how one of the tiercel's there has worked his way up through the available nest sites. Even though he had some success at the say 'less than desirable' sites with a mate, he has made a play for a better site twice - last year taking out his brother at the second best site in the city of Edmonton. So each time he's moved to a better location.
Carly, I believe you intended to refer to biologist Gordon Court in Alberta. He has worked with peregrines for many years, and is extremely knowledgeable. He has rescued and cared for many peregrines. As others have mentioned, Canadian peregrines are no less aggressive than their counterparts farther south. Here in Alberta, there have been many territorial battles, several of them fatal.
Here is a link to an article by Gordon Court about one injured peregrine:
http://www.ab-conservation.com/go/default/index.cfm/publications/conservation-magazine/online-version/2011-spring-summer/peregrine-repair/And an article on just one of the many territorial battles which have taken place in Alberta:
http://www.canada.com/edmontonjournal/news/story.html?id=58c316e0-6a89-47a8-a6a9-392981a8cc40&k=58457