I can only give advice from the perspective of an owner who had a dog who bit someone. Go through the ten day quarantine - it's simply a normal thing animal control does. There isn't much more you can do. Usually, these things blow over. Not being able to see what happens - the gentleman may not have been able to see if the dog bit him or not. All he knew was that he started bleeding. My hope here is - if he intended to make a really big case about it he would have done it the instant the dog jumped on him and not a while later after he started bleeding.