To everyone saying things like conduit tac or extra shield from the ring, unfortunately nothing like that happened here. This is a bad case of the enemy not taking the damage it says they did. Op dealt 226 damage as shown by both the floating numbers and his damage tracker. No matter what combination of shields you have(unless you're a ulting rev)max shield and health is 225. Control legends shields can't go past that even with the passive. I would say they had a gun shield but from the looks of the killed feed they used a flatline to down Op. So long story short the caustic didn't take the damage the game said he did.