Boss power attack

Why does a 20 stam hit on a boss only count as 4 hits in the total amount of hit count?

 

because it takes 5 stam per power hit

5 stam power hit only counts as 1

multiply by 4

 

I know that, but if 1 stam hit counts as 1 hit then I think a 20 stam hit should count as 20 hits to avoid confusion. It just don't make sense to say a 20 stam hit is 4 hits.

 

20 stam is 4 power attacks

then a power attacks would have to show up as 5 hits since its 5 stam