Index: wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- wp-admin/includes/class-wp-comments-list-table.php	(revision 23193)
+++ wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -254,12 +254,10 @@
 		if ( $this->checkbox )
 			$columns['cb'] = '<input type="checkbox" />';
 
-		$columns['author'] = __( 'Author' );
-		$columns['comment'] = _x( 'Comment', 'column name' );
+		$columns['author']   = __( 'Author' );
+		$columns['comment']  = _x( 'Comment', 'column name' );
+		$columns['response'] = _x( 'In Response To', 'column name' );
 
-		if ( !$post_id )
-			$columns['response'] = _x( 'In Response To', 'column name' );
-
 		return $columns;
 	}