On p.439 of the CRB, it states that in a windstorm, "Creatures on the ground are knocked prone and rolled 1d4 * 10 feet, taking 1d4 points of nonlethal damage per 10 feet, unless they make a DC 15 Strength check."
My question is: Does the Strength check prevent BOTH being knocked prone and taking nonlethal damage, or ONLY taking nonlethal damage?
Thanks.