What should be done immediately for a knee injury experiencing severe bleeding?

In the case of a knee injury with severe bleeding, the immediate action should focus on controlling the bleeding while providing support to the injured area. Supporting and elevating the knee helps minimize blood flow to the injury by using gravity to assist in reducing swelling and bleeding. Elevation is particularly important as it can lessen the pressure in the blood vessels, thereby potentially slowing down the blood loss.

Applying ice directly on the skin or restricting movement completely are methods that can be beneficial in different situations, but they do not address the priority of controlling severe bleeding effectively. Additionally, moving the person to a standing position may worsen the injury and increase the risk of further bleeding or damage.