Background on 'spurned' comment
Obviously, you may know this already, but RG3 was recruited by Jim Harbaugh at Stanford to run a 2-QB system with Andrew Luck (holy **** can you imagine?) but RG3 wasn’t down with that action.
It’s come out recently (I can’t find the article) that Richard Sherman persuaded/or at least influenced RG3 to not choose Stanford because, and I’m paraphrasing, ‘Harbaugh is a ****.’ Sherman fell down the depth chart there after getting injured despite leading the Cardinal in receiving his fresh year (Freshman All-American at WR). In order to get past this little hurdle, Sherman switched to cornerback (some say because he’d have to deal with Harbaugh less too). Doug Baldwin, another former Stanford player that is now a Seahawk, also detests Harbaugh, so it’s not just a Richard Sherman thing.
So, the comment “I’ve been proud of you since you spurned(?) us. I didn’t want to tell nobody what I told you. (laughing). But I didn’t want you to go down that path.” is Sherman talking about Harbaugh (I’m pretty sure), and how he told RG3 not to ‘go down that path’ and play for Harbaugh.