"What is this?"
Chen frowned. The black ball looked oddly familiar. But, he couldn’t remember where and when he last saw it.
*POM!*
A stream of yellow smoke filled the space instantly once the black ball landed on the ground. Chen couldn’t see anything in front of him at all.
"Shi! It’s a smoke bomb! Is this guy a ninja?!"
Now, Chen realized why the black ball looked some familiar to him. Those ninjas in anime always used smoke bombs to escape from dangerous situation. However, this skinny ninja did not plan to escape from the scene, but to kill Chen here!
"Kid! Are you completely petrified?"
The ninja laughed arrogantly and said, "I admit that you are definitely more powerful than me! But, your movements are completely restricted in this narrow piping system! Plus, you are completely useless when you can’t see anything around you! I advise that you just stay there and let me slit your throat! Hahaha!"