So what you're saying is...

Their destiny isn't something that can be changed just by coming into contact with Nitori?

That is the case.

The destiny those two walk along is just that unyielding.

...Do you really know that?

Maybe, if there's even the slightest bit of a chance,

Nitori might end up completely breaking down that destiny....

Within the annals of history, there are many destinies swirling about like whirlpools.

The limits that I have placed on her all work to the same effect:

Destroying the chance of her touching the pillars of those varied destinies.