Guide:
Get bomb from demon girl by giving coin, save it
use wire cutters to cut the fence and get a lighter
light up the oil barrel near spawn
light up bottle via barrel for it to become a molotov, save it
knock out boy (you can bring the girl to the room in the right side of the map to get dart and change her appearance, you can use the dart to knock him out or use environmental damage)
use molotov to knock out cop
use bomb to knock out riot cop
and its done
I didn't know about any of this. I guess I got first solution that uses both ladders. I figured the coin was a red herring, so used the ladder to bypass the chain fence, used the wire cutters to dislodge the bat and get the bike instead, use the bat on the boy, the molotov (-2) on the cop, and the bike (-1) and the falling boxes (-2) on the riot cop. Just punched the girl.