At the moment the Orb can attack through Titan Barricades and Titan Bubble because the Orb size is too big. It is basically clipping/bypassing with its hit-box through the barricade and the Titan Bubble.
Playing against Child of the Old Gods in PvP is already annoying af. But the ability ignoring Barriers is even worse.
Stop adding so many counters to Titan Bubble and Barricades. There are reasons why most PvP players never use Barricades often and rather focus on Mobility and Gunplay instead.
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Sounds like a you pro- Actually it's Bungie's sandbox team that's a problem..