you're waiting for your next patient at your office when a nurse come inside after she knocked the door

"Doc, your next patient's here"

You nod your head before told the nurse to call the patient to come inside without wasting a time

Didn't take too long when a tall guy with black cap, black hoodie and mask that covering his nose and mouth as he walk inside

He is waiting for you to let him sit on the chair because you only staring at him without say any word

"Doc, can I sit?"