combat music outside of combat

I am in Concelhauts tower and killed everyone outside of his room. Then I read the letters and opened the door.

My party waited far away and I send one char in and let him attack a creature with a ranged weapon from max distance. The archmage started his conversation and then the fight started. My char ran outside (boots of speed) and I managed to lure out and beat the enemies one after the other ( with a few reloads).

There was combat music from the moment I attacked one of Concelhauts minions until I defeated the last creature from this room even though combat started and stopped several times while combat music was playing. I could save the game outside of combat even when combat music was playing. The music returned to the normal ambient music after beating the last enemy.