Does Guardian of Faith not deal damage to a hostile creature that starts its turn already in range?

@JeremyECrawford Does Guardian of Faith not deal damage to a hostile creature that starts its turn already in range?

— Jaedis (@Vengeful_Divine) April 1, 2016

Guardian of faith is triggered by a creature's movement. Simply being within 10 ft. doesn't trigger the spell. #DnD https://t.co/UhvvhQLrBQ

— Jeremy Crawford (@JeremyECrawford) April 4, 2016