It sounds as though the Crown Prosecution Service(CPS) are going ahead with prosecutions. In case you don't know, the CPS actually bring prosecutions on behalf of the Police and the Public.
It makes no difference that the other guy apparently wants nothing further done, it all depends on whether or not the prosecution(CPS) decides that this is worth pursuing because it is "in the Public interest".
For example, if this was a mass brawl in a public place, then it's more than likely that that is how the CPS will view the matter.
Plus, the fact that people were injured gives more weight to the CPS case that people should be held accountable for their actions.
Sorry if this sounds depressing, but if there was a great punch-up in the street outside where you live, and people were injured etc, wouldn't you perhaps expect the Police to make arrests and try to bring prosecutions against those suspected of the offences?
Were there any CCTV cameras which filmed what was going on? If so, that film will undoubtedly be used as evidence by the CPS.
Get your Solicitor to contact the CPS asap to find out what exactly is happening. Make him/her do the job which they are getting well paid for! Otherwise, you'll be completely in the dark! Make them represent you properly.