Try targeting Brooks instead, I had trouble with him but eventually it's just a cut-scene kill so the damage you do doesn't matter too much, as long as the dialogue is exhausted you should be fine. other than that........try turning the trainer off and load the fight then turn it on. might work
His shields recharge until he runs out of medigel, he's a pain in the butt even on low difficulties, especially Infiltrator and Vanguard.
Haven't tried Engineer but I'm guessing that's the most difficult since he / she probably places turrets.
If you meant that he takes no damage whatsoever, do what the other person said, Brooks is an easier target, just watch your back. Once they run out of medigel just survive until the cutscene triggers, though I believe you still have to take down his shields once...
I'm nearing to the end part of the Citadel DLC. Been fighting with the clone Shepard in the cargo bay. However, there is no way I can kill him. His shield is always at full charge.
Anyone facing this?
I went back through on several play-troughs and Mr Biscuits is right, you have to take down the Clone's shields and armour untill he runs out of Medi-gel, Engineer is the easiest due to Overload and Incinerate Fire boom combos, I did have some trouble with the Infiltrator play-through with him not taking any damage at all but i think the trainer was causing an issue there, either that or i wiped out his gel count too fast and it glitched.....either way, just keep shooting him and he will go down, other than that focus on Brooks for a little while.