I understand it, but it is hard to explain. It has to do with breaking up a single full force vector rearward , into several smaller ones in radial directions rearward to 90 degrees down. How much it reduces from what it could be, I can't say. I can say it isn't enough.
Thats why I added a rubber buffer to help absorb the harsh & sudden metal to metal impact to an impact absorbed into the rubber. The muzzle brake will also reduce recoil. I further reduced the impact by reducing the gas going thru the gas system by installing a smaller gas port bushing. Now its very noticable less than out of the box. Less recoil, better able to keep cross hairs on target, during rapid fire, less damage to reloadable brass, longer scope life, and my shooting buddies to my right appreciate it.