Just a guess as I don't have time to test this yet.. But you should probably be using 'wdParagraph' to move up.. A think a 'line' is not what you think it is, A paragraph will be terminated by the new line where as the line is just terminated by a 'wrap'.

For example in a multiline title:

Table 1: blah blah blah blah blah blah b
lah blah blah.
<br>
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Moving up 1 line would only get to "lah blah blah." where as up 1 paragraph would be "Table 1: blah blah blah blah blah blah blah blah blah." You could then surely just select it as follows:

my $text = $selection->{Range}{Paragraph}{Text};
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- John