Callum and Blaine will both be able to alter the velocity and direction of any moving object or being. They will be capable of increasing and decreasing speed and acceleration, and altering the direction in which something is moving. They could control the movement and speed of projectiles and fired bullets, vehicles and people who are running, flying or using any other motion-based ability. They could also use the ability to force a person or object to begin moving, but will find doing so more difficult than affecting something which was already in motion.