PD was the one from the beginning saying not to litigate. He is one of the two in the meeting. Had known him as a decent guy until this point, and it got all awkward because it involves one of his colleagues.
A week away from work and lots of time to ruminate. But five days ago I was just as outraged as you all because after so many years of post-graduate training I thought I had so many more advocates in my workplace than I apparently do.
Its hard to know what will happen tomorrow, and probably it is best not to ruminate too much and just see what happens.
I can see their approach as one of two possibilities.
1) They want to find a solution where everyone saves face.
2) They are about to railroad you out of the program.
Hopefully, its possibility 1.
One thing that does concern me is the fact that a different HR person is handling your case now. This is not the HR person you talked to. Why didn't the HR person you talked to tell you your case was being transferred to someone else? I almost wonder (this is my pessimistic hat) if your department didn't simultaneously or beforehand initiate a case against you via HR and that's why someone else is handling your case without the person you talked to knowing about it until after the fact.
Overall, my advice (for what it is worth) is:
1) Don't raise your voice
2) Don't get upset
3) DO insist that you are in the right. Don't let them pretend that you did anything wrong. Don't be defensive about telling your fellow resident what happened. Be insistent "I was assaulted/battered, there were independent witnesses who came forward without my prompting them to, and there is no reason why I couldn't have been transferred to another attending/service subsequent to this incident." Be professional, polite, but firm on these points.
4) While being persistent and firm, also work with them to give them an out to "save face" without significant consequence to you. For instance, if you have to do some bogus apology to graduate on time without a negative comment in your file, or listen to a reprimand without it being on your official record, then be willing to do it.
Having said all that about not raising your voice and not getting upset, I wish I could tell you that that is always the right strategy. Unfortunately, it isn't always the case. Sometimes, some people only respond to anger and aggression. I hope that isn't the case here but I can't rule it out.
Lastly, the Vice Chair does not sound like they are on your side with their comment about the GME. If they said to you "We all want an amicable resolution, we aren't here to railroad you, so I don't see the need for GME involvement," that would be one thing. But the way you described it, it sounded more like they didn't want the GME get in the way of their punishing you.