You are amenable to prosecution if the accident took place due to your negligence. It is clear that victim intends to extract money from you on the basis of this accident, whereas it cannot in law be a source of unjust enrichment. If they have not agreed to a compromise then contest his case in the court by appointing your lawyer so that you can prove your innocence. Do not run after them for a compromise as this will not only pamper them, but in the process you may lose some vital legal defences in the court. Engage a lawyer and contest the case diligently.