Holy armor skill
 

Can somebody explain to me exactly how it works? it says your troops have a propability to take only 50% of the damage taken i understand that but then it says "number 3: propability 20%"? so... what does the number 3 mean? next level says "number 4: propability 25%" so is the propability 20% and 25% or does that number 3 and 4 have something to do with it... i dont get it.

EDIT: nvm i figured it out already... the number means how many times each unit can take only half of the damage in each battle...