It sounds obvious that one has to fall for another to remain standing, but to truly keep the Tenno alive, every strike heals the Tenno. The aim of this build is to keep the Tenno alive with by strike against the enemy, especially an enemy that is affected by some status effect.
This is best used with [Saryn] along with weapons that inflict different number of status effects. (i.e. primary weapon to inflict Corrosive, secondary to inflict Gas, and this melee to inflict Toxin/Heat/Electricity, your choice depending on enemy faction).