While Elise and Sakura had made first contact with the fake bandits near the forest cave area, Weiss was almost done with her investigation.
Even though the number of bandits who were staying in the abandoned fortress was decently high, as this fortress was made to handle several thousands of soldiers, their numbers were nothing much.
That was why it was extremely easy for Weiss to continue hiding her presence and do her Investigation. And these people were stupid enough to have only a single guard in front of the room where they kept their treasures, so this made Weiss's task even easier.
She did not kill the guard or make him to faint with the use of any force. Instead of brute force methods like those, she simply used a potion with a special smell that made people to fell asleep. And while the guard was in the dreamland, Weiss was able to do her Investigation without any kind of disturbance.
