In the "Mordor" question: "Unless" is a Group 3 word. As the commentary explained, in order to venture into Mordor, it is necessary that you are brave. "Unless" indicates sufficient conditions. I am not sure why that is in this context. Being brave is certainly a necessary condition for entering Mordor. But couldn't there be other conditions that might be required to enter Mordor? For example, you might need to be "prepared" as well as "brave"? Maybe I need to return to the Group 3 explanation.... Any advice would be appreciated.

idk if this is helpful but, a couple sections later, the course recommends reading widely to help with comprehension.

I find that 19th English novels and short stories tend to be really dense with subordinate clauses, modifiers of all kinds, and referentials. Dickens especially. Even more so read aloud.

Might be fun to read A Christmas Carol this holiday season as prep: https://www.gutenberg.org/files/46/46-h/46-h.htm

This might help your brain adjust to long sentences with many modifiers. It certainly helped me.

@TSpriester This comment clarified things for me. The logic is a little tortured but you could imagine a world where tigers could be trained to not be aggressive anymore (not saying this is true but it could be). According to the situation described in the Disney argument ,there is absolutely no possibility that Walt did not offer the necessary goats to Mickey Mouse.