That is indeed not correct. If you look at all the rules in this file, you'll see that only the ones that end with `[PT]` use `/b/`, as the `[PT]` means "pass through". It tells apache to proxy matching requests to that url and serve the result. It's how we have bedrock installed. When it's a redirect however (one with `[L,R=301]`) it doesn't (or shouldn't) use the `/b/` because we never want the user to ever see the `/b/` urls.