Not asked source of the shots.

Mr. BALL. You heard how many shots?
Miss BURNS. One.
Mr. BALL. Just one?
Miss BURNS. It must have been the last one because I didn’t hear any more.
Mr. BALL. Did you have any idea where it was coming from?
Miss BURNS. Well, it just sounded as though it was back of me. You see, I was going towards Houston Street. I was facing East and it sounded to me as if it came toward my back.
Mr. BALL. You were in the building?
Miss BURNS. Yes; I was in the building.
Mr. BALL. Walking down the hall?
Miss BURNS. Walking down the hall going towards Allyn and Bacon.