Had it been any normal creature, Zheng Yichen's reaction wouldn't have been so intense. Although the one-horned mule was troublesome and cunning, it was a creature of flesh and blood. Extraordinary creatures are still creatures, and their presence wouldn't render them uniquely invincible due to some anomalies.
It's just that compared to normal beings, they hold more possibilities, and now a being without flesh or blood had appeared. Though not long ago he had encountered some skeletal figures that invaded Hazy City through a bizarre event, at that time, the firepower of unfamiliar allies by his side was overwhelming.
It gave everyone a feeling of security, but now that reassuring firepower was gone. Zheng Yichen immediately jumped down from the tree, his strong and robust body could withstand such pressure.