FATE "Raise the Red Flag" Boss doesn't deaggro

Time: 10:29 PM MDT
Frequency: One time? (Haven't tried again)
World name: Goblin
Character name: Shurma Raha
Monster name: Amahire the Redmost
Class/Level: 64 Black Mage
Party or solo: Solo
In-game time: 12:25 ET
Area and coordinates: The Ruby Sea (28.2, 29)

The FATE "Raise the Red Flag" spawns in a boss monster "Amahire The Redmost". This monster doesn't run back to the FATE and will follow you aggresively.

See example in this unlisted Youtube Video: https://youtu.be/mNkYRPlUwtg