Hi, you do not have any cause to worry. First of all contact both Police and Ambulance Service, give them the date/time/location and they will be able to confirm the mans state at the time. They will have a record of their attendance and treatment etc. Also, had you been in any way responsible for the accident you would have been prosecuted. Unfortunately, yes you will have to give details, however, when you do, explain that under no circumstances do you admit liability for that persons injuries and if they proceed with a claim you will call the Police Officer(s) and Ambulance personnell to state in court the condition of their client