Many years ago, I had a technical manager who never felt any pressure to be the first to come up with the answer to a question or the solution to some problem. If I was having a technical conversation with him, and we arrived at a particularly subtle or complex issue, he could go completely silent, just staring straight ahead with his fingers to his lips. I would find it very uncomfortable, and I would start blurting out half-baked ideas to fill the silence, but he would either raise his finger or (usually) just ignore me. This could go on for 30-60 seconds, at which point he might shrug and say "I don't know" or, more likely, have a pretty well formed idea of how to move ahead.
I used to joke to my co-workers that during those silent interludes, he was swapping in the solution from a remote disk.
This manager also typed with one or two fingers, and pretty slowly too. But he wrote a lot of good code.