The girl did not expect Wain to dare such a crazy act. There was no way she could have reacted to Wain's lightning attack.
Initially, Wain had no intention of killing her, but when she mentioned the special card, Wain changed his mind.
The guards didn't notice that Wain attacked the administrator, as they looked straight ahead and rarely looked inside.
Wain decided to take advantage of this. He didn't want to cause a commotion before his time. When the girl was killed, he ripped the card from her neck and positioned her as if she were still working. Someone had to get close to the front desk to realize that she was dead.
Such a deception of vision was only possible because the girl mainly worked sitting behind a high chair. It didn't make sense for her to be standing all the time, given that there were rarely any visitors.
