At the moment of highest tension, the matador leans over the horns to thrust his sword deep into the bull's aorta for the kill.
The bull kills the matador by sitting on him until he suffocates. 
mnli hypothesis: The bull kills the matador by sitting on him until he suffocates.  premise: At the moment of highest tension, the matador leans over the horns to thrust his sword deep into the bull's aorta for the kill.