Of course, Roland could easily manage personal defense, but aside from herself, there were others around her. Perhaps Mengdie could rely on her speed advantage to escape the central combat zone in the nick of time, and perhaps Roland herself could avoid disaster in her unique life form state.
But Zhang Xiaobo was different. Zhang Xiaobo's strength was barely at Rank 2. He could resist most radiation damage and avoid small-caliber bullets if prepared, but escaping from such a wide area instantly was far beyond his capability.
As for young Feng Yi, his situation was quite similar to Zhang Xiaobo's.