Feng Jun's Spirit-Binding Formation was indeed quite effective. Once he formed the hand seal, it directly bound Butterfly.
Huahua was at Mid Qi Refining. Startled, it struggled without pause, its white body leaving streaks of afterimages through the air.
"Come on, give it everything you've got," Feng Jun encouraged it from the side. "If you can break free, I'll give you half a pound... No, that's wrong. I'll buy you an iPad."
Huahua grew even more excited at that, struggling for dear life for more than half an hour.
Unfortunately, although it was at Mid Qi Refining and its body was tougher than refined steel, it was rather small, and in the end, it still failed to break free.
At first, it had been quite nervous. Later, when it realized that it was merely being restrained, it relaxed and focused entirely on figuring out how to escape.
When Feng Jun released it, it did not fly away. Instead, it asked him for its reward. "Where's my payment?"
Feng Jun first took out half a pound of Spirit Beast meat, then produced three power banks. He had quite a few of those on him. He relied on his phone for far too many things, so how could he possibly not carry power banks?
Huahua pawed through them for a while, then looked up at him. "Where's the iPad?"
"You didn't break free," Feng Jun said seriously. "If you had broken free, I could reward you. But you didn't, so I couldn't determine the Spirit-Binding Formation's upper limit. That means no reward."
"Shameless!" Huahua cried out angrily again. "You even cheat insects... Fine, I'll let field mice into the Spirit Plant Formation later!"
"Then you'd be the unreasonable one," Feng Jun lectured it solemnly. "That would be dereliction of duty, understand? If