Disclaimer: I don't own Alcatraz and never will. No copyright infringement intended.
Emerson Hauser loves Lucy Sengupta with every fiber of his being. He can't watch her die – It would kill him if that happened. It's why he's trying everything and anything to save her.
He can't do this without her - It's not an option. And Emerson's already having a hard enough time coping as it is. It's one of the main reasons why he throws himself into the '63's cases. Putting away murderers is a catharsis from all the anger that's building up within him.
Lucy loved (loves) him, and that means everything to Emerson.
She will definitely be saved.