J. E. Craig, that sounds so cool. We have osprey and bald eagles come by and "case the joint" but we have no knowledge of any successful plunges.
My grass carp, at approximately 4 feet long, possible could pull an eagle under the surface, certainly an osprey, if the bird latched on. The birds likely can judge the size of fish they attack.
Might you be able to get some video footage for us?