It’s been awhile, but I have had some that went south. I’ve even had some that I thought went pretty well up until a point and then I knew they were doomed. Forbes has some advice about those terrible interviews in
7 Things You Can Do After A Really Bad Job Interview
Not that you can necessarily redeem the experience, but you can learn from it. One of them is something I had to learn the hard way with lots of things in life. Don’t beat yourself up. After a period of reflection, move on! You can’t change what’s already happened. Get what you can from it and get on with your life!