Who would win in a fight a bull shark or a crocodile?

It depends if lion is far away or not. If it is at a distance where it can sneak up on the bull from behind it has some sort of an advantage over a bull, but if the bull were face a lion in close combat the lion would indeed loose, resulting the bull as the winner.

The reason this is probable because, in the wild, a lone lion may try to hunt a Cape Buffalo bull, but since such an animal is built with a lot of power, sharp hooves and horns, and a very aggressive nature, such a beast is very intimidating for a lone hungry lion: even a pride of lions! This would be the same case with a domestic bovine such as a bull, especially one that has horns and a nasty temperament like that of a Spanish Fighting bull. Lions would much rather go after prey that runs away from them, not turn and fight them.