Golden Coin
The puzzle here was much more dangerous than the others he had come across, including the volcano. The reason for that was that the mere act of trying to dodge these scythes in the first place would end your life.
The scythes were incredibly thin and there seemed to be Runes that colored the mechanisms they hung from and the ground that matched their resonances to the movements of the people who tried to pass through them.
The blades, as a result, would accelerate to cut anything it sensed. The only way to deal with this seemed to be to be faster than the mechanisms could swing the blades in the first place.
However, by Sylas' calculations, you would have to have over 5000 Speed to do that, something not even he could touch, let alone everyone here. That kind of Speed was already approaching speed of sound territory, and likely beyond it.