His task is to lance the bull's huge shoulder muscles; it's unattractive but necessary, both to weaken the bull and to lower his head for the kill.
The bull's shoulder muscles do not have to be lanced to weaken the bull.
mnli hypothesis: The bull's shoulder muscles do not have to be lanced to weaken the bull. premise: His task is to lance the bull's huge shoulder muscles; it's unattractive but necessary, both to weaken the bull and to lower his head for the kill.