Huh.....
Trying to think of what you're referring to...There are like 5,000+/- different buildings being blown up and on fire in this game, you know?
The best way to play this game, over-all, is to do it like FEAR and it's expos...Always take it SLOW, stay in crouch mode unless you like getting your head popped off by weapons' fire...
When you see screen changes, or how can I put this...When the screen starts flickering and your vision flashes, get ready to get out of crouch, enter Uber-Reflex Mode, and get out your napalm grenades, chances are, you're about to start running into Alma's pets or the beast herself, and the best way to deal with them is with the flamethrower and pineapples in slo-mo so you can burn them and get the hell out of the way before they set you on fire.
When dealing with puzzles, and there are many, again, crouch mode, and take it SLOW, every single puzzle in this game, including the massive *SPOILER* tram puzzle at the end, take it slow. If you move around too much, you'll take too much damage from stray shots and you'll miss those all-important ammo pickups and medpacks and armors...
FEAR 1 was all about keeping your head down, and using your head, and when things got crazy with Alma's pets and her own little tantrums, that's when you move fast and don't use explosives to deal with it...I loved watching people in FEAR 1 try to end the game using the MP-50 cannon you got, they always blew themselves to bits trying to deal with Alma's pets, always use SMG then.
FEAR 1: Always carry only three weapons: Pistol and then Nailgun then Plasma Sniper when you got the chances for those upgrades...Keep the SMG. Keep the shotgun, replace shotgun with explosive guns and/or missiles when entering zones with lots of hard targets that sniper weapons can't deal with.
SMG is always the best thing to deal with regular enemies (reppies and Armacham's little weekend warriors)...Shotgun should be used when low on SMG ammo, or learn how to use melee without being hit in slo-mo...It's quite simple once you learn the flow and timing.
In FEAR 2, sniper rifle sucks compared with nailgun, plasma gun at end of game is useless against the final enemies, since they are primarily melee and Alma's super-speed pets, so explosives=bad idea...Better to stick with guns that have plenty of ammo and have good to awesome accuracy and reload times...
The normal shotgun has a stupid reload time in FEAR 2, needs to be patched to be faster, period. The Armacham shotgun reloads nice like FEAR 1, so use that when you can...
If you could tell me what level you're on, I can give much more detailed help...Thanks