As you reach for your weapon, the alien swipes a gesture with its “hand” and you disintegrate into one trillion pieces, along with every creature within three genetic generations of yourself. The alien doesn’t care or acknowledge the tremendous pain you feel as every part of your body separates into its base pieces, leaving the nerves intact until last, and continues to walk through your property completely invulnerable to any terrestrial weapon. The next human treats the alien with respect, as interpreted by ten layers of behavior/language/social analysis contraptions and the two of them have a pleasant chat around the fireplace, sharing eachothothers culture. Nice.