I interviewed with 2 individuals, one was a manager, the other was a principal. The principal interview went good. My first interview was with the manager. He was the one that presented me with the case. He had 3 problems 1) He had a very heavy accent, which made it hard to follow his thought process 2) He became upset after a while, at least that's what I felt 3) He refused to offer any help in the case, so when I answered the first part correct he wanted more of an answer in his head. When I couldn't reach his same conclusion things just went downhill after that. Another thing that deeply bothered me was that I was promised to interview with someone else, and I found out on site that they changed my schedule.