I shoot his protector drone, no damage goes down. I keep shooting it and no damage indicated until it explodes. This would be ok except that KEENER IS STILL IMMUNE TO DAMAGE AND REMAINS SO THE WHOLE FIGHT!! I cannot kill him because he is INFINITELY IMMUNE.
What kind of nonsense is this? This is unbelievable. Is there something I'm missing, or is this just another bug?
I saw on some other posts that if you die and respawn, you can kill him. That didn't work for me. I tried it about 10 times. I quit the game, verified my files and started the entire mission over again and guess what? He was INVINCIBLE even after the drone was killed AGAIN!! This time I was actually able to damage him after a respawn.
I guess even this bug is down to the awful RNG of this game.