I played Leviathan normal on Dec 15, 2017 and noticed a bug at Calus. I was assigned shadow/nightmare realm with two others and my position was right side. I noticed about 6 or 7 times I slid through the barrier without any provocation shortly after killing my psions. I then floated to my death because the next barrier wasn't up yet. We killed all our psions so I wasn't launched in the air and I did not jump or move side to side, I was just aiming down sights, standing and cross-shooting the left side psions. As I floated to my death, I looked back and noticed that the two other players (in mid and left position) were still at their barriers and did not slide through.