Good luck, stay strong.
Sheep’s clothing is a good book. I read it when I had a bullying boss who the company were too naive and feeble to deal with. Reckon he was a full blown psycopath actually, he thought it was funny to hurt next door;s cat.
At the end of the day you have to stand up for yourself and your team, and you’re doing that, which is being true to your own values and the only way you can operate really.
In my experience, senior people who actually do the right thing in these circumstances are rare. HR exist for the company’s sake, not the employees’ and they will resolve this whichever way is most likely to keep the company out of a law case so tread carefully…
And frankly, if they play dirty then you’re better off out anyway.
Best wishes, I know from personal experience these situations can be very hard to deal with and for others to understand…