I am pleased to say that NO, not always - I actually saw the bull "win".
(and by "win" I mean that the bullfighter and his cohorts could not kill the bull in the ring, although surely it could not have survived long afterwards from the tremendous blood loss, and it was probably put down out of the view of the audience.........I was pleased nevertheless that at least the bullfighter did not win..........even if my wife and I return to MX, I will definitely **NOT** be attending another bullfight.............)