Krune realized that he had really underestimated the demons, thinking that they wouldn't be that strong compared to himself, who had five passive abilities and an active ability to rely on. Sadly for him, reality proved otherwise.
At lower tiers, this would have been apparent. But at higher tiers, the strength of the fleshly body was too high to be compared. So, because he was a tier lower, Krune was unable to retaliate properly. On one side, he hadn't faced any demons until now, except for that time when he had just arrived at Layer 2.
Not only that, but he still hadn't gotten accustomed to using his abilities alongside his strengthened body. Krune was still in the process of fusing the two into one battle form, hence the fight with Hazak.