What is intense about Intensive Interaction?

What is intense about Intensive Interaction? Is it the concentration? Is it how exposing it is of our own failings? -------------------------------------- I heard news of a book Chloe and I are in: https://www.bloomsbury.com/uk/nurturi... --------------------------------------- Chloe is my friend. I visit her to keep in touch of course, like we all do with our friends, but I also visit her when I need the company of a friend. The news this week has been brutal - Frith, Arday... Seeing Chloe was an hour out of it all.