But that's exactly what happened: 1) He was in handcuffs, so apparently not free to go. 2) Police told him he can't contact a lawyer because he's not arrested

But that's exactly what happened: 1) He was in handcuffs, so apparently not free to go. 2) Police told him he can't contact a lawyer because he's not arrested. 3) Police forced him to undergo a medical procedure (still, without being "arrested") I'm not sure if "not answering any questions" would have helped the victim in that case.