‘“I did.”
‘“How did that dent get in your cigarette-case?”
‘“I dropped it about a week ago.”
‘“Did you shoot Chase?”
‘“I refuse to answer that question.”
‘At this point the doctor arrived and located the bullet in Chase’s body. Rocca then admitted Chase had been shot with the gun found in his own hand, but stubbornly refused to say anything more.
‘“What’s your opinion, Professor?” Kelley asked.
‘“Well,” I replied, “Rocca is obviously shielding someone. We have positive proof he came directly here and has not left this room. That, combined with the other evidence discovered, absolutely exonerates Rocca."’
[How did the Professor know Rocca had not shot Chase?]