Hearing her voice
She enter the facility and check few things like the doctor's identity usually do. They actually kidnapped the doctor and put her in sleep without realizing what happened. Then she glance at the glass door where she saw patients like they are in a cell. Some of them look pale and there are much in number. They are experimenting those people on their drugs.
She has to get a sample as an evidence on the drugs that they are experimenting. But it'll be a little hard. Since she studied a little medicine and laboratory stuff—it wasn't hard for her to mixed along them.
Suddenly a patient started screaming and she stop and turn to the woman who started smacking her head on the wall. The wall has foam for safety yet the woman's forehead still bleeds and they inject her with some sedative. But it didn't make the woman stop from acting like a beast. She even bite one of them.