deleting a "not fully merged" branch removes working directory but not branch

[nnutter]

$ git bd -d AR-154
Are you sure you want to delete '/gscuser/nnutter/ur/AR-154'? (y|n) y
warning: not deleting branch 'AR-154' that is not yet merged to
         'refs/remotes/origin/master', even though it is merged to HEAD.
error: The branch 'AR-154' is not fully merged.
If you are sure you want to delete it, run 'git branch -D AR-154'.
linus264:~/ur/master (git:master)
! git bd -D AR-154
git-bd: workdir not found: /gscuser/nnutter/ur/AR-154

Do you just need to delete the branch?
linus264:~/ur/master (git:master)
! git branch -d AR-154
warning: not deleting branch 'AR-154' that is not yet merged to
         'refs/remotes/origin/master', even though it is merged to HEAD.
error: The branch 'AR-154' is not fully merged.
If you are sure you want to delete it, run 'git branch -D AR-154'.
linus264:~/ur/master (git:master)
! git branch -D AR-154
Deleted branch AR-154 (was a7648c3).

[nnutter]

#11 kind of addresses this in that it makes it possible to run git bd -d again to try and cleanup remaining mess.