What happens to the direction of water flow when the tube feet contract?

The tube feet are the canals from which the water vascular system is composed. Sea stars and sea urchins use this hydraulic system for locomotion, food and waste transportation. Contracting the tube feet it allows the water to enter the water vascular system from outside. The extension and retraction of the tube feet are by water pressure. 

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me