Nash miraculously survives after falling into a waterfall. It finishes him off both physically and mentally, but it leaves him with a memory and gives him the opportunity to review his life. You become a witness to his weakness and a helper in his recovery. He'll appreciate it, just give him time.

As well as the opportunity to participate in the mission to capture Everett.

P.S. I am writing from a translator, so I apologize for any errors in the text.