Badly done. It's like there was a bungee cord on the front axle of the bike that suddenly ran out of play and snapped back viciously, defying all physics of simply being hit by the car door. It looked ridiculous.
I can understand them not wanting to do the whole thing again because of that stunt going badly, but I'd have Howard Hughes'ed it if I was directing.
...then whoa, differences...
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Have you ever seen someone do a wheelie and accidently pull on the throttle?
It looks just like that.
The car door hit the bike and caused the rider to pop up onto his back wheel. He turns the throttle, which you can hear, which forces the bike to flip out from under him.
Many years of riding various types of bikes and just basic knowledge of physics tells me no, it doesn't happen as depicted in the movie. It was overdone and unnatural. Even when inadvertently popping the bike onto its back wheel and overbalancing, the forward motion is maintained. You can't reverse or stop over 200kg's of momentum by bumping a 20kg car door into it.
The whole thing doesn't suddenly come to a halt and/or spring backwards as depicted. When hitting a large immovable rubber wall perhaps, but a flimsy car door on a car moving in the same direction as the bike? No.
Edit: I recall now the bike was keeping pace with the car when the door was opened wasn't it? All that would have happened is the bike's steering would be upset and they'd take an uneventful tumble at the side of the road. Dust themselves off, pick up the bike and get straight back to the chase. Exercising more caution this time. Not conducive to the plot perhaps, but that's not my point.
...then whoa, differences...
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Too right. George doesn't f#ck about.
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Agreed, the reaction was excessive. They should have just let them crash by changing their direction. There's no momentum from the car door at all in that situation.
"You'll be taking a soul train straight to a disco inferno where you never can say goodbye!"
I tell you what might have been nice, if when the car door hit them they took a spill and the passenger accidently shot the rider or himself (a very plausible outcome). Perhaps a bit harder to depict, but would have worked and given the audience some satisfaction after Julian's death too.
...then whoa, differences...
It should have been a more subtle move / crash but in any case both riders eventually ended up dead, so she was sort of "avenged".
"You'll be taking a soul train straight to a disco inferno where you never can say goodbye!"