Avoiding the razor chain may involve any of the movement types, depending on the time in its cycle that you come across the obstacle. The razor chain is literally a giant circular razor blade that travels along a diagonal chain (usually located within the dark ruins). To avoid this obstacle there are a few things you must be aware of before taking action, so observe your surroundings and think quickly.
When you first encounter the razor chain, it’s simplest to avoid it when you can actually see the blade on its way up. Once the razor is clear, roll through to the other side of the chain.
Contrarily, you can come across this obstacle while the razor is in the air and offscreen; this is where things get hairy. When the razor blade is offscreen, there are two things that could be happening. The razor blade could be still traveling up, in which case you might have caught a glimpse of it right before it left the screen; or it is on its way back down. In the first of the two situations, you are safe to roll forward a few times and attempt to squeeze underneath the razor blade before it hits you. This might be the best course of action because rolling backward to create time for the blade to travel back down and up again could take too long, allowing the darkness to catch up with you. In the second situation, where the razor blade is likely on its way back down, you will have enough time to roll backward once, maybe twice, to give it some time to leave again. On the rare occasion that you are on an elevated surface and the razor blade is in the lowest position you can jump over the blade, however this is incredibly risky and rolling underneath the razor blade yields a much higher chance of surviving.