The head of the guards in this mansion is walking back to the basement. In his hand, he's holding a notebook filled with contact information of important people. The master of the mansion asked him to bring it from his office.
He's walking back from the office calmly. Because he's not in a hurry. His master seems to be thinking of interrogating the captured intruders as the priority instead of contacting the people in note.
And among them, one of the intruders was actually working under Cavarro. And he betrayed the other intruders.
The traitor is also going to tell his master about everything he learned from where he was working undercover at and what jobs he did. He has been doing it for a few months and gained respect from others in the team. That's why no one expected him to betray them.