To clarify:
Fischer deals damage to the enemy equal to his current health. He recieves damage equal to 50% of the damage dealt.
In bounties, Fischer deals damage to the enemy equal to his current health, which is increased by a health multiplier. The damage to the enemy is multiplied by the damage multiplier.
The self damage is not multiplied, so the self damage is equal to 50% of the un-multiplied damage dealt.
Eg.
If Fischer has 100,000 Health, and a 3x multiplier.
Regular:
Fischers Health = 100,000
Enemy Damage = 100,000
Self Damage = 50,000 (100,000 x 50%)
Featured Bounties:
Fischers Health = 300,000 (100,000 × 3)
Enemy Damage = 900,000 (300,000 x 3)
Self Damage = 150,000 (300,000 × 50%)