I've been out of Destiny for a few months, so I don't know if this is an old thing, or something that's changed going into RoI? I noticed it straight away in PVT Crucible while we were ghost hunting, tho. Half-damage to anything not touching the ground, whether that's falling off a surface, standard jump, or class jump. Since when? I knew you could slide under them, or emote to avoid damage altogether, but... eh?