When you’ve disrupt you’re partners base, or better still they’ve put themselves in a structurally inferior positions through overcompensation, desperation, or lack of knowledge, you mold yourself around the new position to ‘confirm’ it.
One example of the above breaking some one down from closed guard and over-hooking the head, or better yet grabbing the belt if you’re playing in the gi. They’ve broken down and you’ve ‘confirmed’ the breakdown by re-adjusting grips.
Another way to think of this principle is funneling a person into fewer and fewer options until they have no other option but compliance/submssion. As such, I’ve also called this concept/principle ‘corralling.’ Moo, moo buckaroo! ;o)