The restraint system held him off and prevented any injury. Some people believe they could be trapped in the harness and drowned or burned to death. The problem is without the harness you'll probably be knocked out and more likely drown or burn to death. If after closing the door and buckling up you touch the door handle and touch the belt release device (all of which are usually different) you'll be prepared to exit quickly.

Statistics show one chance in 30 the harness will do you more harm than good, but 29 out of 30 it will save your life.