Is there anyone familiar with folding as a defensive technique?

[ono]

Amir Khan folds when he gets hit. Literally.

[thirty3breeze]

There is the book by the us naval institute titled boxing. In it it states folding is "dropping forward, hands high, so that the blow is either slipped or taken on the top of the head. It is a method if getting close enough to start the attack without taking any serious punishment."