@JeremyECrawford are climbing, crawling, swimming, etc, considered "Difficult Terrain" for a UA Ranger who can ignore DT?

— Isaac Priestley (@weracketeer) December 6, 2016

Movement modes—climbing, crawling, swimming, etc.—aren't terrain. #DnD https://t.co/B2aQUoLGgR

— Jeremy Crawford (@JeremyECrawford) December 6, 2016