I can't tell from the video, but was it fair hooked?
I've foul hooked one of those on clousers the last two times I've been up there -- both times right near the mouth like they missed the fly, or pulled off at the last second. But, given their normal feeding habits (grubbing on the bottom), that would be strange.
On the other hand, you saw it come up and hit so clearly they do. Maybe the Denison buffalo have started eating shad.
... Buffalo eat alot of shad like game fish , that is their main diet in most lakes .that is why you will get bit using bass lures etc . buffs will take shad quicker than carp will