I ride.
If her bumber hit his leg...of course he might fall over...but those police bikes are HUGE...I think there is so much gear on them that your legs are protected in a slide...but still it's possible to hit a leg especially at an angle. And that might explain the shot through the open window.
But it sounds like too much info is missing...as someone mentioned, I'd love to see the unedited tape!
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LumbarSpasm
Or just a pain in the butt?!