a question about Analysis of Multihoming in Mobile IPv6

Hello, everyone,
          I am confused about a sentence in Analysis of
Multihoming in
Mobile IPv6. 
The sentence is "The fact that a mobile node has
multiple interfaces does
not 
imply that it has multiple HoAs and vice-versa" and
located at the last
paragragh on page 10.
          I think one interface should have a corresponding
address or more.
So, if a mobile node is in its home, each of its interfaces
has a address at
least.

Anyone can give me the detailed explaination or a scenario?
Thanks.



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