> In this situation it should be ok for you to not answer questions, wait until your involuntary adrenaline reaction wears off, and then have a conversation about it.

I don't think it is if you know someone else committed the offence and they are still out there, potentially still offending.

If you know the identity of a rapist, saying 'I'm not going to talk to the Police until convenient for me' is a rotten attitude.