“You don’t get it, son. This isn’t a mudhole… It’s an operating table. And I’m the surgeon.”
-Batman killing the Mutant Leader in a fight
“You don’t get it, son. This isn’t a mudhole… It’s an operating table. And I’m the surgeon.”
-Batman killing the Mutant Leader in a fight
Superman also doesn’t kill him, he faked his death and superman figured out at the end, but decided to ignore it.
that’s just semantics. they fought, batman died (literally, according to some definitions of death), superman believed he had caused it - as he intended. Superman killed Batman.