Battle music behaves different than vanilla
In vanilla, if you went into the Data Files folder and deleted the tracks in the Music/Battle folder, the game would play the next available track in the Explore folder.
In OpenMW, deleting tracks within the Music/Battle makes the game go silent for the duration of the battle, after which the next Explore track will play.
(RM-4134 from redmine: created on 2017-09-30 by R C, , closed on 2018-04-25 by Alexei Dobrohotov)