swallow feeding it's fledglings without landing then this should not pose much of a challenge. And it wasn't. Only real challenge was pointing my camera at the right spot of water, you never really know where they will jump.
Since this was some distance away I just went manual focus and set the lens to infinity.
Exposure 0.002 sec (1/640)
Focal Length 200 mm
ISO Speed 400
I just had to ignore some annoying people in front of me that couldn't appreciate a D300 going at a high speed burst.