The media won't say this, and neither apparently will the police, so I will.

[Cyberman]

Well, my four-penn'orth (for what it's worth) is that deep down, past the layers of sophistication in which we clothe ourselves, humans are still animals and will behave with animal instincts at times; probably more times than any of us would feel comfortable admitting. Like everyone else I don't know enough about the woman in the news article to pass opinion on her mental state or cognitive abilities. I am, however, aware that like most species we tend not to accept the prospect of our own imminent demise.

How many times have we seen the buxom, swimsuited teen in a horror flick just stand there watching while the deformed maniac raises his axe over her head, and we in the audience are thinking "look, just kick him in the bollocks and feckin' leg it, he's got a feckin' axe"? Script necessity is only part of it; it also has something to do with the thought that this can't be happening to me. Same reason for why rabbits freeze in the road and get turned into Frisbees - it's not happening. It seems to be one of those instincts that we haven't had time to evolve out of the species, if it's even possible to do so. Improper attribution of Darwin Awards notwithstanding.