xsl:for-each changes the context item. If, within the loop, you want to access the item that was the context item outside the loop, you need to bind a variable before the context item disappears:
Code:
<xsl:variable name="c" select="."/>
<xsl:for-each select="....">
<xsl:value-of select="$c/x/y/z"/>
This applies regardless whether the inner for-each selects nodes or atomic values, but in the case where it selects atomic values there is the advantage that you get an error message.
Loop twice, then inside loop select nodes??
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