That makes perfect sense. Remember though: Hack and Slash is not just that one strike, it's the synopsis of a fight. But if you want a particular moment to stand out, because it's truly epic (like a difficult boss finally going down, for instance) you could use the move just for this single strike.
Maybe the player had to get close to the monster to deliver the killing blow, and the monster got the chance to claw and bite while it was being gutted?
Or the player lost control of his/her weapon while striking, dislocating a shoulder in the progress?
Or the dead monster fell on top of the player, its spiny exoskeleton piercing the player's leather clothing?
Or the monster coughed up a ball of bile with its last breath and the acid burned the player's face?
It makes perfect sense. But remember to keep the fiction flowing afterward, don't just deal damage: Is the player now disabled in some way? Is he pinned or blinded? And what's next?