Threat Build

I was plundering a load of forums for prot paladins, and took wee snippets out for spec's, weapons etc. I ended up looking at some talent trees and questioning my own and ended up with this
Ardent Defender, well..i have never tried without it, and 30% less damage...at 35% health. Do i get 30% damage reduction from being hit at 38% health?...i dont think so