The one at the door was the person who had gone to check the areas with the disturbed signal. Even though checking all those places required quite some time, the reward was proportional to the effort, so they were quite happy to receive the result.
The man who returned had it worse than Ye Shuang. The latter was good physically and was swift. Furthermore, she only needed to stay in one spot to watch the place she was assigned. In fact, she was so free that she had time to come back for a food run. The former had worse. Even with his colleagues' help drawing the attention, he had to be cautious about being seen during his movement. Much less running about, when he was at his mission points, he had to hide like a thief. The result was he came back with dust on his face and a body like a farmer who had been moving bricks and had not showered for days.
