enemies' attack won't kill you unless you set the Min Health to 1 or below. enemies' heavy attack still bleeds you. enemies' grab attack would be ignored if health is below 400 (a cheap precaution of grab attack from instant kill you).
for the script to work properly, set Min Health to 2 or above.
set Min Health to 1 or 0 is equals to deactivate the script. health won't drop below specified Min Health.