Final answer:
If the injured person cries out in pain while using a tourniquet to control life-threatening bleeding, you should stop tightening the tourniquet and provide reassurance.
Step-by-step explanation:
If you are using a tourniquet to control life-threatening bleeding and the injured person cries out in pain, you should stop tightening the tourniquet. A tourniquet should only be tightened until the bleeding stops or cannot be tightened anymore. Continuing to tighten the tourniquet may cause unnecessary pain and further damage to the injured person.
Instead, you should reassure the person and provide support. If the bleeding continues, you can apply direct pressure to the wound to help control the bleeding until medical help arrives.