Capturing some weaker descendants of the Feng Clan to deliver letters was definitely a move in line with the Ghost Emperor's reputation, but to average out every person from the Feng Clan, the Ghost Emperor himself did not possess such ability.
Therefore, the composition of the couriers was a small portion of the Feng Clan and mostly Bird Demons.
All of these Bird Demons were followers of the Feng Clan, and now following the Feng Clan to their deaths in this delivery mission was quite reasonable.
In order to bless their journey with success, Zhang Chi even gave them a rather auspicious name, calling them Shunfeng Express.
Once these Bird Demons were delivered to shore by Hong Li, they flew out in all directions.
Their only task was to fly around, and if they encountered anyone attempting to attack them, they would leave behind a Memory Stone; that would be considered mission accomplished.