If Bob is pinned, then he's pinned. If the illusion lays over Bob's physical form when it's cast, then the illusion is pinned.
The text on p. 139 says:
Quote:
this range.
A wizard may create an Image or Illusion Duplicate of
any figure present, including himself. Such a “double” may
even be created in the hex occupied by the original. Either the
original or the duplicate then immediately moves one hex in
any direction, confusing the foe.
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This isn't a license to ignore every rule about movement in the book. A pinned figure can't move. If the illusion or the figure must move immediately, then we have a condition that cannot be met and the illusion vanishes.
How else could it reasonably work?