Dealing with test steps 'Manual teststep' and 'Mock response

I think it would make sense that it starts at the same time as the start step. In the case where the Mock Response would be waiting for a post from a server that was triggered by a previous request step, it is conceivable that the server could send it before the response was received or parsed by the request step. If the Mock Response only started listening after the request step was complete, the post from the server would be missed.