What does Witness pre-broken mean?

[zenith bluff]

When people are posting a pre-broken run, what do they mean and why? Is there such a thing as a post-broken run?

[rancid zodiac]

It’s a cheese that people do to where u pre break the buttons on his chest to immediately do a damage phase and skip the entire encounter

But if u don’t one phase then u have to continue with doing mechanics