Volumen Hydrargyrum’s characteristics can be grasped by just observing its attacks once. Despite being a very fast attack, it is comparatively simple.

When mercury is in the shape of a whip it is the base that controls its extremely quick attacks, but the tip virtually has no power. The power of the blade is basically formed through centrifugal force. For someone as experienced as Kiritsugu in melee combat, the path this kind of attacks would take is easy to predict. This is also the characteristics of controlling mercury with pressure. Only parts with a large mass can fully exert its power, while the strength slowly gets weaker towards the tip end. Kiritsugu had already analyzed this weakness of its when he realized the mercury ends that stretched far from the original mass to search for enemies aren’t as agile as the cutting whips.

- Fate/Zero: Act 6, Part 4