Zu Wen felt that the concept of nerves or butterflies was inherently alien to someone like Fang Zhao. At least, he'd never seen Fang Zhao panic.
The fact of the matter was, if Fang Zhao were an ordinary person, or if it were the Fang Zhao from before the end of days, he would have reacted just like Zu Wen. But people who had endured an apocalypse were definitely different.
Fang Zhao would get nervous and afraid too. But during the apocalypse, everyone had to find a center so they could carry on; otherwise they would break down. Some fought for the people they loved, others for religion or another surrogate.