The person who came to take the interview shared google docs where he had predefined questions, not sure if he prepared it since he couldn't explain the problem properly. Till the end, I was confused and multiple times asked to explain with the example. He just said question is self explanatory. He literally muted himself. I had to ask him if he was with me or not. I felt that the person was unprofessional and I couldn't concentrate fully because of back and forth communication regarding his presence.