Realized halfway through a mock interview that the algorithm wasn't the thing being graded

I solved it, technically, but the friend running the mock stopped me afterward and said the whole time I'd been silently typing and never once said what I was thinking. Went back and did the same problem again just narrating out loud, badly at first, and it was uncomfortable in a completely different way than the coding part. Nobody tells you the thinking-out-loud part is a separate skill you have to practice on its own.