Winston,
Basically, she thought he was going to "spin in place" leaving a gap to the right. That would have left a bit of a gap over there and predicting that, she went for it. Problem was, once Mr. Twitchcase started the spin, he climbed OFF the brakes which allowed him to drift forward cutting her off. Had he stayed "brakes to firewall" he would have stayed in his lane but spun there, not nearly as bad. For that matter, had he come off the brakes like he did BUT crank his wheels hard left he would have started to point his nose back in the right direction and again, ladybiker would have had her gap.
Another issue is that the car to her right SHOULD have kept going and given her enough gap. Instead, that car braked hard putting it RIGHT into the path of the idiot to the left and "closed the box" on ladybiker.
On a bike, it becomes very easy to understand that you can brake hard, or you can steer hard, but you can't do both. The more you brake, the less you can steer and vice versa. The issue is that there's only so much you can ask of your tires.
THE SAME IS TRUE OF A CAR as this twitchcase has so graphically shown! It's just that you can't "sense it" on four wheels the way you can on two.
The ladybiker may, and I repeat MAY have made a different mistake: it's possible that she "fixated" a bit too deep on the twitchcase because he put out "bad vibes" (and yeah, us bikers get to where we can dang near smell idiocy in the air from a particular driver). In which case she may have lost her continuous sense of what OTHER cars were around her to the right, left and rear. That would make her hesitate some, deciding on how hard she can brake and/or what her dodge options were into other lanes.
One mistake she DID make: she was too deep into the middle of the lane. That is very seldom the best place to be. Hugging one edge or the other means that in a case like this, go ahead and brake HARD hoping that whatever is behind you will be able to brake and steer just a wee hair to miss you, not really bad odds if you know things have gone way deep into turdland dead ahead.
That aside, Ladybiker is NOT in the wrong her, legally or morally. She made one minor mistake in technique (center of lane) but that usually wouldn't bite her in the butt. Twitchcase did WAY more wrong, first not paying attention and getting in the first trouble (which only needed braking to solve), second getting into the spin and then third freezing up the steering once in.
Barsterd should never be allowed behind the wheel again. Frickin' hopeless. Ladybiker ALMOST pulled it out, and would have if Twitchcase had steered hard left like he's supposed to or the cage to the right had driven away from trouble instead of staying with it.