Very interesting. A Phantom of Truth actually feels like it has a fairly low enemy count (basically just the 7 Byakhee), so this helps pull them out, preventing the encounter deck from turning into just a constant stream of treacheries. At the same time, there's a test to avoid it, so if you need to, you can try to pass the test to avoid dealing with the enemy. I don't like this as much as Hunted by Byakhee (which isn't blocked as easily by ), but it's still a creative way to mitigate the quest's low enemy count.