As I see currently it is possible to set the threshhold directly, but I think for Pack with an increased Health Cap (like mine) it'd be better to set it to percentage since for for a pack where the cap is 100 and the threshhold is at 8, it's not the same as 20:8

I thought about this when I put the feature in. The scenario I had in mind was that if I had a health of 100 vs. 20 of a normal "Steve". Why should a player with 20/100 get the heart beat when a Steve with 20/20 wouldn't? It just seemed weird to me. :)