first trick to make the fight faster is knock the weapons off of 3 enemies so they would follow me. then lure them to the incompetent flamethrower to get quick kill on via friendly fire. next part simply find the lab coats with the key, unfortunately they only spawn after the cutscene and in order. after cutscene trigger I'm lucky to get low damage chip for the entire level to be less hard. i stun the 4 enemies and do combo strikes. I do the same with 3 after meeting the doctor. the area filled with more enemies is tough but lucky because the AI has no hazard sense I can lure them to the flame for quick kill on the group only after stunning them. once cleared I grab a health tube while the doc unlocks the gate. here I tried to abuse the rage mode as much as possible.