Before Mr Bai and his men were taken away to their makeshift prison that night by Taliban, they were blindfolded and had their hands tied.
Throughout his captivity in May this year, Mr Bai, a sergeant, was regularly fed, allowed to exercise and left physically unharmed. After 17 days, the militants gave him and his men a fresh set of clothes, including a turban and a pair of comfortable shoes.
Each of them was also handed the equivalent of US$480 (Dh1,760) in cash and told they would be released on one condition.
“We had to swear in the name of God that we would never join the army or police again and never fight against fellow Muslims,” Mr Bai told The National. “They took us to a mosque and an imam made us take an oath in Pashto.”