Does heavy armor master affect damage done from traps?

@JeremyECrawford does heavy armor master affect damage done from traps? (I.e falling rocks bludgeoning DMG)

— Brian Daniel Smith (@bdsmith1986) October 7, 2016

Heavy Armor Master only reduces bludgeoning/piercing/slashing damage from nonmagical weapons. #DnD https://t.co/M51pMrjbKN

— Jeremy Crawford (@JeremyECrawford) October 8, 2016

@JeremyECrawford Does that mean it's useless against natural attacks (claws, bites, slams, etc.)?

— Rick Kittenhugs (@thekittenhugs) October 8, 2016

If a natural weapon is nonmagical, Heavy Armor Master works against it. #DnD https://t.co/1RU3yq8E6X

— Jeremy Crawford (@JeremyECrawford) October 8, 2016