C161 Gentle past

"This …" The policeman faltered and said, "That afternoon when Liu Xiaokai and I were on duty, he picked up the phone and told me to go arrest someone. He said to bring him back to the prison after we went there for questioning, and since I was supposed to change shifts, I didn't hear him clearly when Liu Xiaokai told me that it was his bro called Hu or something like that