I'm still totally lost at the sewers. Cleared all path so many times now only to get to the zombies at the end and die.
Due to the answer further up, I already did mad training sessions. Train with Gogo and CTRL to do all in a few sec, over and over, back to sewers – and die. Then I though that can't be right, maybe I should go to the gym, but that cost money. So I went to a save game editor first and gave me lots and lots of money. Then did every training of the available 4 types, 5 times. I clicked around in the world and saw the shooting range, so I also upgraded the weapon a few times and did training there, as I had the money to do it.
Back to sewers and now at the zombies there was at least a combat interface and not just instant death screen. I could choose between 'Axe hack' and 'Exalted attack'. 1st selection initiates a combat round, 2nd one is death again. No matter which option I choose and which order.
OK - at least there was some progress after cheating lost of money to get lots of CTRL-multi-week-training in a few sec. Let's continue that path. Back to Gogo & train with CTRL another 10 or 15 days in fast forward.
Back to the sewers and still only the 2 options with the zombies, only to die on the 2nd attack.
So I have to say, it doesn't look like training with Gogo & in the gym (& shooting range) is the solution to this dying in the sewers to zombies dead end. Or do I just have to do this another 30 or 50 times with CTRL?