Why does RequestHandler::beforeRedirect() "fake" AJAX redirects?

I have a general question regarding the logic inside of RequestHandler::beforeRedirect() related to AJAX redirects.  Why does CakePHP try to "fake" a redirect- why not just do a true redirect?

This logic appears to be confusing the Security Component in my application (and I don't want to disable the Security Component in any way).  I'm curious what is the purpose of using a requestAction() call?  When I remove the ajax handling in the RequestHandler::beforeRedirect() my application works perfectly.

Thanks for any insight you can provide.

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