During the occupation, Faiz Mohammad was forced to take part in a delegation sent by Kalakani to negotiate with Hazara groups opposing the Tajik leader. According to his account, he managed to subvert Kalakani's plans and caused the mission to fail. However, he and the mission's leader, Noor al-Din Agha, a Qizilbash Shiʿite from Kabul, paid a heavy price for this: both were sentenced to death by beating. Faiz Mohammad alone survived the ordeal and was saved by a colleague. The Persian mission in Kabul, under a directive from Reza Shah to do what it could to aid the Shiʿites of Kabul, sent medicines to his house. He eventually recovered enough to travel the following year to Tehran for more medical care. After less than a year there, he returned to Kabul, where he died on 6 Shawal 1349/3 March 1931, at the age of sixty-eight or sixty-nine.