Suppose a person was out camping and suffered from a bad puncture wound to the inside of their leg. As a result of the puncture wound, their femoral artery was severed. Excessive bleeding occurred, but because one of the campers had a medic kit, they were able to apply a Tourniquet and stop the bleeding.

My questions are:
>How long before serious damage to the limb occurs, i.e. nerve damage, tissue damage
>When does necrosis begin to set in
>When the Tourniquet is eventually taken off, how will the body respond to the influx of blood that has been sitting for so long

Lastly
>How does a tourniquet being applied to an arm or leg effect perfusion, and how does it effect the blood that is left to sit in a static state within the appendage

When the tourniquet is eventually loosened, will the influx of stagnated blood do anything to the person or patient? Can a septic shock occur?