I did the weekly heroic 3 times today on level 30 for valus ta'aurc. I was behind the crates under the walkway at the far left of the room from where you come in. Standing back from the crates shooting at the Cabal with shields up. I had full health and a Cabal Ultra goes to hit me with his shield and kills in one swipe. He couldn't and didn't make contact as there was crate and about 4ft between him and me. I didn't get hit by anything else as he was standing right in front of the opening. It happened on the second run but the guardian was next to me and I was revived. Unless their shields have the same powers as the Psion, then this shouldn't be happening. The only other explanation is that it's so hot in that armour, his armpit stink killed me when he moved his shield.