"It's because of the magnet," Feng Wu said matter-of-factly. "It has opposite magnetic poles. One side will attract the iron, but the other side will repel it.
"When the magnetic powder of both poles is mixed together, it won't affect the blades, but when they're separated, I can tell one pole from the other. One will attract the iron, while the other won't.
"Luckily for us, most of the magnetic powder here can attract the iron.
"Therefore, I tried to spray as much magnetic powder on the walls as possible, and they pulled the blades away.
"Once the blades are caught, it's not easy for them to break free again.
"Therefore, all I needed to do was arrange the powder in the shape of a finger and wait for the blades to get stuck. That's all."
Feng Xun said, "I don't understand."
Dugu Yamo shook her head as well.
"That's too difficult. I don't understand a word. What are you talking about?"
