The entire group accompanying Crhono to chase the beast was too relaxed. Don't be mistaken, this doesn't mean that they didn't take Crhono's words seriously. What happens is that a group of people as powerful as them had been searching for the beast for several days without any clues, so they were convinced that the beast had already left.
Although they knew from Crhono that the beast could not be tracked by his divinity and perception, even so, his common senses such as sight and hearing are not normal thanks to his great power.
Even though they were such a large group, they had not sighted the beast after an exhaustive search, so they began to think that the beast had left, and their guards had lowered.
The only one who never let his guard down was Crhono, who had fought against the beast and knew its capabilities. That's why when night fell, instead of relaxing, he adopted his dragon form and was more alert than anyone else.