Murong Jiu wasn't being sentimental.
With life and death at stake, she had no time to think about propriety between men and women, especially considering Senior Brother Cheng had always taken care of her like an elder brother in his early years.
Senior Brother Cheng seemed frail, but that was because he was undernourished from birth and struggled to gain weight no matter what he ate. However, he wasn't as weak as he appeared in front of Mo Yu; once outside, he toppled Li Tiezhu, who tried to stop them, and quickly carried her into the mountains behind.
Senior Brother Cheng frequently went to the mountains to gather herbs and was familiar with the area, leading her deep into the mountainous region.
Murong Jiu's condition wasn't good; she passed out several times on his back.
During this time, Senior Brother Cheng found some wild fruits to replenish her sugars and fluids.