This could be a moon on a stick fantasy quest but which pads best resist being whipped down your legs on impact? My Fox Launch Pro’s certainly don’t judging by the scars on both knees.
I’ve seen several videos of pro’s crashing and their knee pads (being new and of decent quality as they get them for nowt) from various brands getting whipped straight down the legs. Aaron Gwins most recent crash at Lenzerheide for example.
I take it there is no practical way to prevent it, other than not crash landing on your knees, or not riding a bike fast on difficult terrain in the first place.