The nonlinear storytelling... (spoilers)
I've got to say, they didn't do the nonlinear storytelling well at all. I figured out pretty early what was going on and still couldn't tell if certain things were happening now or long in the past. Decades are supposedly passing between episodes. I'm sure many viewers were utterly confused.
And they also seem to forget all the powers and abilities that Geralt has. He barely uses magic or appears stronger than a normal man, just a better fighter. Walking those planks on the mountain should have been nothing to someone with his gifts like spatial perception and body supremacy.