[Groff] rotating a pic block

[James K. Lowden]

http://lists.gnu.org/archive/html/groff/2010-01/msg00007.html
http://www.schemamania.org/sailing/bh/

In looking for a way to rotate pic figures, I found Ted Harding's
message, which offers a nifty trick.  But it seems it doesn't quite work
if the figure to be rotated is a block containing a macro call.  

Could someone tell me, please, why in the file bh.ms the quotation
marks in the Boat macro aren't rotated along with everything else?  Am
I using the macro or block feature incorrectly, or does "rotate" need
to be modified to handle this case?  

A matter of escapement?

Many thanks.  

--jkl