Celerity is a Discipline that grants vampires supernatural speed and finesse by expending vitae. Normally each dot provides an additional action that can be used for movement, attacking, or other physical feats in a single round without penalties for multiple actions. This extraordinary speed violates the laws of physics in that the Cainite doesn't experience any change in momentum, friction, etc. A knife thrown by someone using Celerity isn't any faster, and a vampire moving at incredible speeds will never catch fire no matter how fast they move.