Reminds me of that time I was taking climbing lessons in the Belgian Ardennes. Helmet on, in harness, hanging in the ropes, holding tight to not fall, we where climbing half way up the mountain, when a person out of nowhere ask if he can pass and just flew up the key section of the route. It was just a local, casual clothes, no harness, no helmet, no rope, maybe not even proper climbing shoes but I can't recall that. Just casually climbing the mountain like he was on a lunch stroll. Even now with years of experience I still don't have that confidence.