At Harmon Mansion,
Hearing the cars entering the premises of the Harmon mansion, Leon quickly rearranged some of his work and ordered Dylan, "Complete this, I will be back." His indifferent voice and aloofness were capable of hiding all the thoughts of him.
Dylan's fingers continued to move the keyboard of his laptop at a good speed without responding to Leon while he shut his laptop and exited the study room.
Stretching his neck and flexing his shoulder, Dylan didn't make any sound. Leon didn't just leave, he activated the microphone while leaving so that he could hear whatever Dylan speaks and there is a camera anyway to get the footage.
So even if Dylan wanted to do something it was very difficult and put his life at risk. So ignoring the rest, he focused on completing the work.