In the small world Owen Bertram found himself in: killing one creature would spawn two, killing two would spawn four, and so on!
The reason why the Saintess of North Ice and the Elderly Witch thought Owen Bertram was lucky was that even an ordinary cultivator should have been able to comprehend the "mechanism" of this world by the time four strange birds appeared.
With the strength of the strange birds, four, eight, or even sixteen of them could not cause any harm to Owen Bertram.
Compared to the Fourth Crown Prince's world, where killing an indigenous person would cause them to respawn stronger and perpetually pursue him, Owen Bertram's world only had a group of strange birds attacking him. That's why the second stage of this world was probably the most relaxed of the Nine Realms Sky.
Owen, grasping a strange bird and observing it closely, had no other purpose but to take advantage of the opportunity to benefit himself.