To avoid any permanent damage, the seatbelts keep you safe in most situations. If there’s any unforeseen circumstance, before you can even react, a modern seatbelt retracts forcefully to adjust occupants into a safer seating position when the airbags deploy.How does it do that? With a seatbelt Pretensioner and Load Limitor, of course! Like a valiant but tragic hero, the seatbelt Pretensioner sacrifices its life in an accident, in order to save yours.