Unable to Delete 'man1'

I'm using a LaCie external with Time Machine and wanted to make some extra room, so I deleted some of my backups that were just taking up room. But, I can't get the time machine backup folder out of my recycle bin now. When I try to delete it, it takes a long time and then says "Cannot delete item because 'man1' is in use" -- I've tried deleting through terminal and also by holding Option and no dice. Can someone shed some light, please? (Also, I can't restore the folder for some reason)

Any help would be great..