<?php
// Go get the nodes we care about.
$node1 = node_load(4); // Whatever nid the node reference field is pointing to.
$node2 = node_load(5); // Same.

// Build the node bodies, which should include the radio widget for voting on them? Else, you can tack it on at the end.
$node1 = node_build_content($node1); // teaser and page are optional, and default to FALSE.
$node2 = node_build_content($node2);

// Output it. This should probably go in a theme function, and from your main logic, you'd be calling theme('smackdown', $node1, $node2);
$output = '';
$output .= drupal_render($node1->content);
$output .= drupal_render($node2->content);
return $output;
?>