Faster than most average cameras to be able to capture the prop I would assume. Either way nice picture.
I wasn't criticizing the photographer. Just trying to guess the shutter speed

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Most point and shoot cameras can do better then 1/1000. This cheep $150 job can shoot 1/1600
http://shop.panasonic.com/shop/model/DMC-FH8S?t=specs
His camera can do 1/8000.
The limiting factor here, was the lens. The best that lens can do at 400mm, is F5.6, and that's what he had it at. Based on the conditions of the day, he chose to lock it on 1/1000, and let the camera figure out apature and iso.
If he had gone higher, say 1/2000, the lens is already maxed, so instead of ISO 400, the camera for the same shutter speed would have picked ISO 800, and it would have started introducing noise.
So he did all the right things. The only thing he could have done better, was buy a faster lens that's at least 400m.
Considering that will run you 13 grand for the 500mm F4.0, I would have done the same, and stuck with the lens he has (which by the way, is a $2,000 lens)