Added flashbang? Well, now I'm curious... Seems like a good enough excuse as any to try and get the secret ending.
Edit: Nope, still can't really manage it. OK, I have to know, what is the intended way of getting away from the Nightmare when you get cornered by her? Because there's at least two spots where you need to go into a dead end, and my strat of "shine the light on her and hope the light doesn't go out in time for me to get on a high spot and quickly jump over her, and also hope the light doesn't become too dim for me to see literally ANYTHING" seems quite inconsistent and unintended (and rather annoying given that last bit).