I had exactly same experience. First interviewer was arrogrant, he tried to confuse me even though I was giving the correct answers. I solved the coding problem that he asked in less than 10 min. It was not easy but not hard question. He then asked me how can I test this. I answered, actually he like my answer. However, he had a different approach in his mind which was very similar to my answer. He behaved like what he suggest is better than mine. Second interviewer seems like he interested in my previous research work. He asked me a harder question than first interviewer, I solved it. There was one problem, he helped me to solve. I was feeling like I did really well. However, after having lunch with two other guys. They said there is no good match and go home.