How to get response error from run Test case step?

I'm not sure if this is what you are after, but I make extensive use of the "Run TestCase" test step. To help me debug, I always add the following to my "common" test cases tear down script:

def logPrefix = testCase.getName() + ': '
log.info (logPrefix + 'Number of results = ' + testRunner.getResults().size().toString())

for(result in testRunner.getResults()){
	if(result.getStatus().toString() != 'PASS' ){
		def failedTestStepName = result.getTestStep().getName()
		def logPrefixStep = logPrefix.trim() + failedTestStepName + ': '
		
		log.error(logPrefixStep + 'TestStep "' + failedTestStepName + '" finished with the status ' + result.getStatus().toString())

		for(testProperty in testCase.getTestStepByName(failedTestStepName).getPropertyList()){
			if(testProperty.isReadOnly()){
				log.info(logPrefixStep + 'Output property: ' + testProperty.getName() + ' = ' + testProperty.getValue())
			}else{
				log.info(logPrefixStep + 'Input property: ' + testProperty.getName() + ' = ' + testProperty.getValue())
			}
		}
		
		for(message in result.getMessages()){
			log.error(logPrefixStep + 'Error message: ' + message) 
		}
	}
}

Is this what you are after?