Now you can give me a "suspension of disbelief" argument. But no one on earth is reasonably stupid enough to STOP running from the guy who murdered two of her friends, impeding her escape to taunt that person. They'd only run as fast as their legs could carry them, she didn't even seem to stop from exhaustion/or to catch her breathe. "Looking back to a killer" is a horror trope that no one in real life would actually do. Trying to say that's realistic...I think is the wrong argument to make. And the turkey baster scene (where he was going to fill it with his sperm and shove it in his kidnap victims vagina, to impregnate her...completely skull fucked the overall serious tone/suspension and almost came out of nowhere and was a very stupid moment. It also didn't seem like it was suppose to be a joke...so it's the best example I can think of because the whole third act didn't fit with the previous acts and that scene was probably the worst in the movie. (other than the dog vs. girl car scene.)
I say non threatening doggo, because the dog clearly was not actually acting aggressively but it had added growling sound effects in post production.
Example of such Until 24:40 But that's sort of what I saw, while watching.
Also like I said, the third act is the weakest part of the movie. The drawn out chase with the dog is absolutely stale compared to what had come previously, it's not even remotely as threatening of a scenario.
Just my opinion, I can see why you might like the movie. It had some good things in it, but I think it was a wee bit overrated when it came out. Like a lot of horror movies really...