Oh, well. Let's fast forward a tad. Our brave Ragnar? He duelled the troll in a game of 'Fox and Geese' for over twenty hours. Remarkably, he did so flawlessly, never exposing himself to any real danger. We often come across the term 'machine-like' being thrown around, but I can't think of a better word to describe Ragnar's feat.

Fate/Lost Einherjar, Chapter 2