Two search bars, but only on the help page

I know multiple search bars is frowned upon, but what about on the help page? For example:

Like Amazon, the main purpose of our site is to search for things. My thinking is, they're having trouble finding something, so they go to our help page, get the answer, then they want to try the search again, but now the main search bar is gone? Another option discussed is have our main search bar include help pages (it's already a combo box that can search different data sets), but this seems like a bad precedent to allow results that aren't in the main content. Imagine if you searched for something on Amazon and got their help pages in the results list.

So we really want to keep the main search bar in the header, since the header remains consistent throughout the site - and on the help page have a large search bar towards the top of the page that only searches help documents. Our page would look a lot like the Amazon help page, we even plan to have the suggestions at the top to get them started. Is Amazon breaking the rules, or is this an exception to the rule?