models/classes/runner/navigation/QtiRunnerNavigationSkipItem.php
public function move(RunnerServiceContext $context, $ref)
    {
        $session = $context->getTestSession(); 
        $session->skip();
        $session->moveNext();
        return true;
    }
public function move(RunnerServiceContext $context, $ref)
    {
        $session = $context->getTestSession(); 
        $session->skip();
        $session->moveNext();
        return true;
    }
Do the move
@param RunnerServiceContext $context
@param mixed $ref
@return boolean
@throws \common_Exception