How does one emergency tranquilise a 1500 pound excited bull? That seems impossible. Other than a bullet of course.
IMO, the bull was either exhausted or someone shot him.
that is the problem. they have to hit him with something so strong that it will knock him out quick no matter where it hits, even fat deposits. so if it hits muscle or worse an artery or other bloodline it's pretty much instant OD.
in town here some lady had a 2000+ lb moose in her back yard with her baby.(not sure what young moose are called, lol). they hit it with the tranquilizer and it dropped in a minute. they literally boarded it up on a skid and they winched it on the back of a forestry truck. they always say they live happily ever after in the wild , but that's not the case.