I've been in this situation and similar and find that your tone of voice can be an invaluable tool in calming people.
When standing, or sitting, face to face people tend to mirror the person opposite so slow gentle movements and a calm tone of voice can bring someones heart rate down and ease the heightened emotions that come with coming off.
It can be harder then it sounds, especially if the histrionics set in.
I've been in this situation and similar and find that your tone of voice can be an invaluable tool in calming people.
When standing, or sitting, face to face people tend to mirror the person opposite so slow gentle movements and a calm tone of voice can bring someones heart rate down and ease the heightened emotions that come with coming off.
It can be harder then it sounds, especially if the histrionics set in.