Honestly it was a really rough few months, I think I mostly got through it by trauma bonding with the person who was being bullied, were actually good friends now. After that email, I ended up reaching out to HR because that was the tipping point for me. I left shortly after to another department and there was a full investigation where (for various reasons) the person wasn’t fired but quietly moved along to a different department. The investigation opened up a lot of gates though and that department has gone through some pretty drastic changes to address the toxic culture.