[Hiccup is right about that much. With the way that Estinien is, staying away from the fight completely is largely out of the question. He seems uneasy at Hiccup's idea, and supplies with some amount of hesitance:]

I had thought to call upon its powers willfully. If it so desperately wants me alive... surely it would protect me in the heart of Achamoth.

[He's not completely insisting but he does think it might be the best chance they have.]