Why use this grip for Precision Shooting?

Precision shooting is a growing sport. Have you ever noticed the grip used for precision shooting? It is quite different than what you may be accustom to and this video explains why a different grip style is used.

Timeline:
00:00 - Intro
00:26 - Overview
04:06 - The Grip
05:34 - Test yourself
07:51 - The Death Grip
09:44 - Wrap up