If you left court before having your case called before the judge to address the fine issue, I can assure you that a warrant may of been issued for your arrest anyway due to your failure to appear in court. Furthermore, unless you go back to court to address the fine issue and speak with the criminal attorney, you will never know for what reasons you were possibly going to be arrested. More than likely you are currently on probation, and have yet to comply with all the terms and conditions of your probation. If so, then the judge has the authority to impose jail time if you do not complete your probation successfully.