Investigation.

Shi Lang provided them with the details of the matter and also instructions about the things they needed to pay attention to and things they needed to avoid. Places such as isolated buildings and dark alleys were forbidden. They all were allowed to move at a specific distance with him as a center and he also passed on a batch of military-grade communication devices. 

He said, "This thing I just passed you is called a mind comm, and they do not need you to speak out loud. You can communicate with me with your thoughts. Just set a code name and as long as you think of that code name, we will be connected. My code name is Ace, and I hope that you all just set your own names for this event. If you get confused during the process, it might lead to great danger." 

The class understood and they all replied with, "Sir, yes, sir."