"James, I froze 'em with a wide f-stop (f4, I think), and panning with them. The light was good, so the exposure was just under 1/1000 - plenty to freeze them, with no flash. I was on the ground, prone, for that one. "

Thanks for the info. I had thought that the light looked a bit strong, so I assumed that it was flash. Having said that, the shot is GREAT.

Cheers
James