Yeah circumstantial though some what impressive. That was the Beani's tank and turf. Dropping another big bad fish in there and having it get hammered on before it can properly acclimate and adjust you can get the same effect vis versa with all those species. I've seen African cichlids beat the sh*# out of Flowerhorn, Oscars and many other large cichlids under the same circumstances.
Beanis are no joke, and really near the top of all aggressive cichlids. Flowerhorns and Oscars are not nearly as aggressive. A butti would be the most aggressive and one of the largest African sp. Usually they cannot be kept with anything period.