Back when I was a kid ... fishing with my Grandparents ... we noticed a commotion on the surface of the water, about 75yds away. We first thought it was "jumps" (surface feeding Bass) but, when we got there, it turned out to be a ~4lb LM Bass with a ~3lb LM Bass in its mouth. They were separated & sent on their way.
I'm with you "seeker" .... I don't think it's all that rare, as far as it happening. Seeing it firsthand, though .. might be
... cp