The videos of the slide off the upper deck of the 747 were frightening. Even worse was the pilots’ means of escape: grabbing a handle that was attached to a metal ribbon strap cable and lowering to the ground in a free fall. If you got that metal strap around your neck or leg or arm, you were dead. That thing gave me nightmares. The only film I ever saw of someone using it was filmed sometime in the 1960s.
Just a guess, but I think most people that are injured during aircraft evacuations are elderly people, My elderly dad fell off a step ladder some years ago and got banged up. Having to take a 20 to 40 foot slide ride at that age is an issue..