Nick showed them the Quicksand Mechanism.
First, they had to pass through a deep and dark corridor.
The corridor was narrow; it felt crowded for two people to walk side by side, so they proceeded one by one and avoided the patterned bricks under Nick's guidance.
At the end of the corridor was a square space, surrounded by totems and sculptures of strange shapes.
But Nick didn't let them study these. Instead, he picked up a piece of broken stone from the ground, stood at the entrance of the corridor, and said to them, "Watch closely."
The beam of the flashlight hit half a brick engraved with a lotus totem.
With a light throw, Nick sent the pebble in a parabolic arc. With a plunk, it landed on the brick surface and bounced into the unseen darkness—
Three seconds of silence.
The walls on both sides of the corridor suddenly retreated! And the floor of the corridor sank rapidly! Soon, a pit at least ten meters deep appeared before their eyes!
