Is blood shunting a dangerous situation in which the vital oragns shut down and body goes into circulatory shock?

No, blood shunting is not a dangerous situation. It is a normal process that occurs when the body is under stress, such as during exercise. Blood shunting allows blood to flow more quickly to the muscles and other organs that need it most, while reducing blood flow to less essential organs, such as the skin and digestive system. This helps the body to maintain its blood pressure and oxygen levels, and to avoid circulatory shock.