+static void player__observe_system( enum player_subsystem id ){
+ if( id != localplayer.observing_system ){
+ struct player_subsystem_interface *sysm1 =
+ player_subsystems[ localplayer.observing_system ];
+
+ if( sysm1->sfx_kill ) sysm1->sfx_kill();
+ localplayer.observing_system = id;
+ }
+}
+