Skill understanding

k basically when hit, you get 20% chance of activating this skill or something

then it blocks the next 5 attacks

The first part is right. The second: not so much. There's some footage of the skill in action. The Paladin does gain a boost in power. From what I can tell, you can sustain +30 weapon attack as long as you don't take touch damage. In 5 touch hits (which are guarded), you will sustain the +30 weapon attack for 30 seconds. It also seems it cannot trigger within 30 seconds of the previous cast.
Video Footage

You be the judge.