오컴의 면도날은 아직 검집에 있다

Missing, extremely new, or very obvious to obtain.

A reference to the Occam's razor (can be spelled as Ockham's or Ocham's), which is also known as the law of parsimony. It's attributed to William of Ockham and is a philosophical tool for "shaving off" unlikely explanations. In the game, there are 5 different endings of how March 7th beats Skott, so Occam's razor (if treated as a physical tool) is sheathed.