Nobody:, the teammates in endless toying with the last shambler so the sapper(s) can finish rebuilding everything:
you can noclip out the map if you accidentally heal a crippled teammate near the wall in one of the ditches during the sharpshooter section.
If you get bored of your fifer/drummer selection, you can open up the class select UI, change your nation/regiment, and you'll have their songs!
