I would like to suggest that you should take along a lawyer with you and if not a lawyer you should have a companion.
Secondly, you can definitely ask for a complaint copy if not provided by them,
Thirdly, a behavior of a person cannot be predicted but yes they will strict towards you as certain allegations are against you. Like I said it depends upon the case how serious the charges are.
Fourthly, walking out won't be a solution to any of the problems, this may create more doubt about you in them.