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And also Vine didn't slam on the brakes.
Coming to a controlled stop and keeping control of the situation before the road opens up can be preferable when you have someone behaving unpredictably. I've been in a similar situation where I have pulled to the left only to find that the idiot behind is attempting to undertake. I've also been seriously injured by a tailgating motorist as I've pulled left out of their way, I wish that had happened at a slower speed.
Just playing devil's advocate. If a driver had beeped a driver in front who'd then essentially slammed the brakes on in front of them (the classic 'brake check' dick move), I'd say that'd be considered to be escalating the situation. How is what Vine did different?