Compare this with descending Halls Fell in the dark, you can't really let go as you are never sure when another rocky step is going to appear until you are a long way down the ridge.
We set off at 6.30-7.30pm depending on time of year that way you get to Threkeld as it gets dark, Leg 2 is the night section hitting Seat Sandal as the sun starts to get up. That way there's no rocky bits in the dark at all.