Okay, I'm just reading the Moves for the Fighter:
Merciless: When you deal damage, deal +1d4 damage.
Scent of Blood: When you Hack and Slash an enemy, you take +1d4 damage forward against that enemy.
What am I missing? Isn't Merciless better in all situations? It works with Volley and the "Deal damage to the attacker equal to your level" option from Defend, and it's extra damage all the time, not just for your next helping.
So, if I haven't missed anything, could the damage from Scent Of Blood be increased (to d6?) to balance things out? Or the damage from Merciless reduced? (to d3?)
And this repeats itself with the Bloodthirsty and Taste For Blood Advanced Moves.