The Wolf is charged
Xiao Zai spent the rest of the night shaking the bars of his cell and demanding answers about Chu Yun from the apathetic guards, who kept ignoring him as if he wasn't there.
His mind kept cycling through nightmare scenarios where Chu Yun fainted from the cold, got frostbite, or got hypothermia, and ended up collapsing from exposure. Xin was much warmer than Zui, it was very likely that Chu Yun would underestimate the cold and end up putting himself in danger.
Rationally, he knew his anxiety and fear wasn't helping either him or Chu Yun, but his panic kept mounting with nowhere to go. He was minutes away from shifting into his wolf form and trying to squeeze through the bars, even though the only thing that would accomplish was getting him stuck between them.