If the fight was fair, but it isn't bull fighting experts watch how the bull moves and reacts in the ring and this is when the onesidedness starts. Those spears you see hanging from the bull are used to weaken the muscles and of course there is also the loss of blood.
So the poor animal is at a massive disadvantage before the matador even enters the ring.
One on one would be much more fun and if the bull was rewarded with a life of luxury and a field full of cows for stomping the odd matador, even better.
If you want to see real one to one fun with a bull pay a visit to the Huntsville Prison Rodeo where the inmates have to snatch a tobacco pouch full of money off the horns of a big bull.
Everyone including the bull seems to have fun !