Redirection is intended as an aid when creating a report. You can redirect a trial run of the report to yourself, or any other individual, in order to verify the contents. Once you are satisfied with your report, you can turn the redirection off, and schedule it for your target audience.
You can either redirect reports where SendReport is true or false. A situation where redirecting reports in which SendReport is false would be to see reports that would otherwise be undelivered (i.e. that failed your logic for setting the SendReport flag in your report).
Below are the possible conditions and outcomes when using the redirect feature: