[Monami6] Problem with MCoA draft

In the "Multiple Care-of Addresses Registration
draft-wakikawa-mobileip-multiplecoa-05" Page 10, there is a paragraph
described as below:

   The second situation is when a mobile node does not want to return
   home, though one of its interfaces is attached to its home link.  The
   mobile node disables the interface attached to the home link and
   keeps using the rest of interfaces attached to foreign links.  In
   this case, the mobile node sends a de-registration Binding Update for
   the interface attached to the home link with the Binding Unique
   Identifier sub-option.  The receiver of the de-registration Binding
   Update deletes only the correspondent binding entry from the binding
   cache database.  The home agent does not stop proxying neighbor
   advertisement unless there are still bindings for the other
   interfaces.

   The last sentence of this paragraph make me puzzled. Why the HA doesn't
stop proxying while there are no more bindings for other interfaces.  In my
opinion, the right expression may like this: " The home agent does not stop
proxying neighbor advertisement if there are still bindings for the other
interfaces." or "The home agent stop proxying neighbor advertisement unless
there are still bindings for the other interfaces."

  Anybody can clarify the puzzled for me? whether it's just a typing mistake
or for the poor of my english? 

Thanks!

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