Before Sebastian embarked on the journey of scaling the Domain Mountain, after listening to numerous failure stories that were told by Quad, Sebastian had a good idea of the difficulty of his endeavor.
This was why apart from preparing by building his telekinesis powers advantage, he also strived to get the perfect plan.
Sebastian developed such a meticulous plan for this journey that he prepared so many contingency plans for numerous different scenarios.
This was why once he encountered his first setback; Sebastian did not panic as he simply switched to one of the contingency plans that were in his head.
Sebastian's original plan A was to take advantage of the brainless attacking methods of the beast. Due to how one-dimensional their mode of attack was, he planned to directly tear a passage through their middle and get to his destination.