Question

how wrapping a person who caught fire can extinguish fire?

Answer 1

Answer:

If any one is cut off the fire will be put out. As the fire blanket completely surrounds the person whose clothes caught fire, it seals the person's body surface around the fire and cut's off the oxygen supply to the fire, thereby putting it out

Answer 2

Answer:

When a person is wrapped with a blanket then the blanket acts as a barrier and prevents the fire from getting oxygen supply ( which is important for combustion) and hence the fire is extinguished.