Painful sounds

Long Xun instructed his team to enter from all the four directions while he, himself entered the factory all alone through a window leading inside. He liked to work alone so there was nobody with him. Without making any sound, he slowly ans carefully opened the window and he entered inside.

Once inside, he hid behind some large boxes and started to look around and study the whole situation. Luckily, he saw no one. After looking around for a few seconds, he felt that there was something strange about the factory. It was just too silent.

He moved forward silently while still being in the shadows and he tried to look around as much as possible. Weirdly, he didn't find anybody around at all. It looked like there were no people inside the factory.

"Shadow A did you find anybody there?" he asked through an earpiece attached to his ear.

"No, Boss. This area is clear." The leader of Shadow A team replied.

Long Xun frowned.