the irreducible leap that remains?

Does " the irreducible leap that remains" mean " the irreducible element that remains"?
That is, I don't understand the nuance of the word leap.

Context:

Whatever its stigma, "intuition" is a term that we simply cannot
do without, because it denotes the most basic constituent of our fac-
ulty of understanding. While this is true in matters of ethics, it is no
less true in science. When we can break our knowledge of a thing
down no further, the irreducible leap that remains is intuitively
taken. Thus, the traditional opposition between reason and intuition
is a false one: reason is itself intuitive to the core, as any judgment
that a proposition is "reasonable" or "logical" relies on intuition to
find its feet. One often hears scientists and philosophers concede
that something or other is a "brute fact"!atht is, one that admits of
no reduction. The question of why physical events have causes, say,
is not one that scientists feel the slightest temptation to ponder. It is
just so. To demand an accounting of so basic a fact is like asking how
we know that two plus two equals four. Scientists presuppose the
validity of such brutishness!aa, indeed, they must.