Michael cut the nobleman's leather into two​

because he already knows what will happen in future

Explanation:

In the book titled "What Men Live By" written by Leo Tolstoy in 1885. Michael cut the nobleman's leather into two​ "because he already knows what will happen in the future."

This is evident in the fact that Michael is a fallen Angel who God has made human for his disobedience.

To become Angel again, he must answer three philosophical questions. Among which is the question of "What is not given to man?" Which deals with the foreseen death of the nobleman.

Thereby, knowing the noble mam would die, instead of making the thick leather boot, he made a pair of soft leather slippers.