There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
IMO between captive felids anything can happen. In zoo we sometimes learn that a lioness kills a male lion, a leopard kills a tigress. So what ? What about their health, age, physical conditions (are they poorly fed, mistreated ?) ? We don't know but anything is possible. We just have the brute fact.
In wild, if a big felid wants to kill a smaller one (by a significant margin), the maximum that the latter could hope is to escape itself. Of course accident can happen, a bad fall for example. But I don't believe at all that the smaller cat could exclusively kill the big one. The big one could be wounded too, ( leopards for example could lacerate the opponent's face in a case of desperate attempt, thex excell at it), but killed in a furious fight ? No.