Forum:Nirvana High Paladin's Effect

I run a Turtle Deck and went up against a Perfomalpal/odd-eyes/magicians Pendulum Deck and The guy ran a Nirvana High Paladin, One of his effects is if this card destroys a monster half your opponents life points. My question at what point does that effect no longer apply, does it go all the way down to one and stop or does it end the duel, Any help will be appreciated. -F5y6