I've got a multilingual site.

When a user tries to access one of my pages, say /es/agreement, I would like to display the English version of that page, regardless of what language the user is browsing.

What is best SEO wise:

1. To redirect the user to the English version /en/agreement?
2. To display duplicate English content on /es/agreement and /en/agreement?

Of course duplicate content is not good, but if I choose #1, will Google think that the /en and /es versions are somehow linked, and display English content when searching with "Spanish" language preferences on Google?

If I choose #2, could I set nofollow noindex to avoid having duplicate content?