Thank you for your post CM. A bugger's muddle indeed. It's almost as if in writing the regulations the writers kept tripping over themselves and then had to rewrite sections only to find further contradictions necessitating further rewrites resulting in more contradictions.........
I think the simple answer to the OP's question is answered in the link provided by Bleve. Where did they go? But that then begs the question what effect does that have (I've grossly simplified the issue) and you've begun the task of untangling the mess.
This is FAR 91.3
FAR 91.3 Responsibility and authority of the pilot in command.
(a) The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft.
(b) In an in-flight emergency requiring immediate action, the pilot in command may deviate from any rule of this part to the extent required to meet that emergency.
(c) Each pilot in command who deviates from a rule under
paragraph (b) of this section shall, upon the request of the Administrator, send a written report of that deviation to the Administrator.
The FAR 91.3 far simpler, clearer and operationally practical than our version CASR 91.215.
Why don't we have something that closely resembles 91.3 (b)?