Given the example:
Was it then that I thought of Alan? No, earlier. From the very first wave of panic my mind reached out to him. Yes, even then, in the heart of the fear, there was a still small voice saying, This will change your life. Sometimes that’s what it takes to bring people together, a crisis, a tragedy. You could say that’s what brought David and I together. I would not have been in that place were it not for my crisis.
There are two nominal relative clauses starting with what. The first one has it after what. Do they call this it expletive?