for my play on survival it was about avoid, stealth and on a few occasions smoke bomb and run like hell to the next autosave point.
Near the end of the game in the firefly hospital I stealth killed 10 guys or so then when 4 more guys came in I just said f this used a smoke bomb and ran through. The area where you usually hide as several run by before the guy pops out of the door I through a brick at one guy meeled another two and just managed to get to the door to trigger the cutscene. With a quarter of a bar of health left.
This then forced me to go all stealth for the final section since even after my health went back up to a bar and a fraction when I died. First time I got to a counter before the final door. The coast was clear no fireflies there and none looking that way then two fireflies spawned right there. That wasn't being flanked and not paying attention to my surroundings that was just mean. Next time I smoke bombed before jumping over the counter, the two fireflies spawned choking and I was through the door and done with combat for that playthrough.
