I worked as cabin crew for 3 years after uni for a bit of a change (getting paid to travel with nice looking girls was a pretty cool move at 22!).
From the overwing exit to the wing, there is usually a strap that attaches to the wing and fuselage to help guide to a safer place to drop down.
But in the case of an evac (Did 1 real one in that 3 years and then 2 practice ones a year), passengers tend to “freeze” so you drag them, push them, do whatever it takes to get them out in the critical 90 seconds. A few broken ankles/arms/legs or whatever is pretty unimportant relative to the alternative……….