Beth f-ed it up again. On survival difficulty, it is VERY annoying to try to get to your idiot companion, who just jumped off highway or rooftop and broke his legs, because his is just a total moron! And if you must take a long way around, to get to him, he will just disappear and "go back to settlement". As I see, the only way to fix it, is to give all companions immunity to fall damage, like power armor has.