What happens in the batman v superman battle?

Quick Answer
Batman and Superman clash in a fierce showdown orchestrated by Lex Luthor; the fight escalates until both heroes realize they have been manipulated and cease fighting.
Explanation
In the 2016 film Batman v Superman: Dawn of Justice the two iconic heroes are brought into conflict by the scheming Lex Luthor, who seeks to pit them against each other. The confrontation begins with a dramatic clash that showcases their contrasting powers and philosophies. As the battle intensifies, the violence and destruction grow, highlighting the stakes of their disagreement. Mid‑clash, both characters uncover Luthor’s deception, recognizing that their conflict is being orchestrated for his own ends. The realization prompts them to stop fighting, setting the stage for a tentative partnership rather than a continued duel.