I can't remember is that area time based as well? If it is just grab all the ammo and evade as best as you can if a enemy is in front of you shoot him or her that will make a path and you can run through.
Here is what I do. I basically start on the left side and go around to the right making stops whenever is a new place I need to get into when I get to the place Brandogg is talking about after I leave there there is two paths one to the right and another to the left. DO NOT GO TO THE LEFT PATH there is a chainsaw manic up that path that wants to relieve you of your head!
Instead head right grab the items and when you reach a wooden box to the left of you there will be a villager to the right standing next to a cow get rid of the villager. If by this time the bell hasn't rung you have 4 choices. You can run into the shotgun house, you can go to the house across from it, You can stay outside and hit and run or you can go and do Brandoggs strategy.
If you decide to go to the shotgun house here is my strategy.You can go into the house where the door is open if you do this a chainsaw manic will come out of woodwork block off the lower floor first grab the items head up the stairs grab the shotgun get the items and go by the bed and wait. Get out your shotgun and blast at the maniac. Also try to get them to line up and let them get close and at last possible moment blast them.The closer they are when you use a shotgun the more damage it does.
When it gets to crowded make a path and jump out the window with the ladder. If at this point the chainsaw dude is loose head to the house right in front of you get the items there and if you feel they are getting too close block the door there is a metal door in there you can knife the lock. Head in grab the items and wait.
There are some things you can do go by the door and when you see the door shaking open the door forcefully or get your shotgun out aim at the door and blast them when they open it or use a grenade.Hopefully by this time the bell has rung. If not it is going to be a pain to get out use a flash or normal grenade, after you hear their cries of blindness or after the explosion run out of there and float like a butterfly sting like a bee.
Brandogg has a good idea for saving ammo. Here is mine shoot him in the face that will make him/her wince in pain then kick him/her that will put him on the ground and you can knife em.
My ammo conservation tip helps when there is 2 or less enemies. Brandogg's will work with lots afterwards you can throw a grenade or use your shotgun.
Hope that Helped.
