Food chain conflicts are always interesting.
Jaguars, on the other hand, more routinely take out Caimans. They’re more muscular cats than are leopards and Caimans are probably on the average smaller than your average croc.
http://uk.youtube.com/watch?v=YVjh02RmMnc
And tigers far more routinely hunt crocs, as well. Well, if anyone is interested in which cats have the best handbags. ;)