In BVS, Superman was targeted by Lu Se and began to fall into the trap designed by Lu Se. These traps include luring Superman's girlfriend to local conflict areas, and creating traps to lure Superman to save his girlfriend, resulting in casualties among civilians and soldiers. There is also encouraging a disabled person with a broken leg (disabled by zod War) to spray graffiti on Superman's statue and do all kinds of things. At the same time, taking advantage of the fact that Superman's sight can't penetrate lead, it creates the illusion that the disabled person committed suicide against Superman at the hearing.
These superficial events were seen by Batman, but Batman in this period was so radical in character after fighting crime for a long time that he didn't notice Lu Se's plot. At the same time, he also had a dream that Superman ruled the earth. For the sake of public safety, he began to prepare for the fight against Superman.
In addition, Superman's dissatisfaction with Batman is also shown in the movie. First, Superman is a reporter to investigate the current situation of Gotham. His investigation work is also induced by Lu Se, and he is dissatisfied with Batman's aggressive strategy of cracking down on criminals. Later, Superman's attitude towards Batman is too clear, and even conflicts with the boss of his newspaper.
Against the background of the conflict between the two superheroes' ideas, and Lu Se's various threading in the middle, Superman and Batman finally have their first small-scale conflict. That is, when Batman was chasing criminals in a batmobile, Superman stepped in.
Superman warned Batman to stop, "Don't show up again when the bat light is on", and Batman responded with that famous saying, "Tell me, will you bleed?" . This became a prelude to the second serious conflict between the two.
Lu Se's reasons against Superman can be known in later conversations, which are related to Lu Se's personal experience in his childhood, so I won't elaborate here. He deliberately set fire between Superman and Batman in order to kill Superman by Batman's hand, and he also gave great trust and expectation to Batman's success rate in killing Superman. He not only tried his best to find kryptonite and acquiesced in Batman's stealing, but also kidnapped Superman's mother to let Superman go to Batman's battle site (Batman's carefully prepared home).
Here's how Batman fights Superman. Superman is not completely invulnerable. His biggest weakness is kryptonite. Batman stole kryptonite from Lu Se and made it into kryptonite dust bullets and kryptonite spears. In addition, we have prepared high-strength armor and some auxiliary weapons, such as acoustic weapons and automatic machine gun traps.
Superman is too conceited about his own ability. He had no idea that Batman really prepared such a deadly weapon that he became weak under the sudden attack of kryptonite dust and was almost killed by a kryptonite spear.