[hcoles]

I'm pretty sure there are some lawyers here or members that are knowledgeable about legal proceedings.
Case/Situation - My friend was in a group of road cyclists and another cyclist in the group rides close to him and takes a deliberate swing and hits him in the mouth. He goes down and breaks his collar bone. The assailant continues riding away while others in the group stop and help. The victim has no idea the punch was coming.
The local police dept. is called and they come and take statements/etc.
What does my friend do now? Our understanding is the police report will get completed and then go to the DA. What does he do or not do to get the DA to press charges?
Thanks.