One major downside of lacking self-awareness is that one's actions become predictable.
Though I don't know how the Native Council got him to accept the instructions,
based on his earlier behavior, Ariel's probable purpose for coming to Shangjing was to investigate the cause of Deng Feizhou's death, as well as to find out how much the Night Watchman knew about the Native Council's movements.
The reason Ariel had to kill just now was an instinctual response provoked by a threat to his survival.
Now that the threat has been removed, as an entity with no "self" to speak of, having obtained the answers, his objectives were already met.
And my performance indicated there was no possibility of silencing me.
Under such circumstances, choosing to immediately flee is not unusual.
"But through this method, he truly became a Divine Envoy,"
Fu Qian murmured to himself, looking in the direction where Ariel had disappeared.