Yeah, now that I'm free to be more liberal: you've got this set piece fight scene, your lead and the assassin are tossing each other around the room, being elbowed, gut punched, etc, and you decide to overwrite all the ambient noise this would create with what appears to be the fucking theme song*. So, now you've got two guys beating the shit out of each other but no actual sounds of them beating the shit out of each other save the occasional grunt that slips through a music lull.
It's like watching the fight deaf and only knowing someone just got hurt by the look on their face; only you frequently can't see them.
* PS: the theme/title sequence sucks. It's like something from the 60's.