Completing 16 orb Oryx challenge perfectly yet Oryx still has 1/4 health left after detonation. Tried several times with different fireteams and he is just not dying. Is this a known glitch issue?
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After you stun oryx, you still have to fire on his chest.
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This generally happens when either 1) the people in middle don't do enough constant damage to his chest to keep it open, or 2) the bomb detonators don't do it in sync or they don't stay long enough to get all 4 at their location.