Based on Adjutant's intelligence, Su Ming arrived in another sector of the space battlefield in the blink of an eye.
Even now, those two still hadn't dealt with Brutus. There were probably only two reasons.
First, if Superman didn't go for the kill, he wasn't even as good as Shazam.
The latter also followed a no-killing rule, but Billy was only a child and didn't know his own strength. Sometimes he accidentally hit too hard, and then... sigh!
But everyone made mistakes over little slipups. There was nothing to criticize, as long as he knew he was wrong afterward.
The second reason was Luthor. He simply didn't want to fight the enemy alongside Superman. He only wanted to duel the enemy alone, to prove that he was stronger than Superman.
There was nothing to be done about that. Baldy was just that kind of person. You could call it his obsession. He lived to prove that he was stronger than Superman, that humans were stronger than Kryptonians, and he accepted no arguments.
Although Baldy had now become a hybrid of an Earthling and a Martian, he still insisted that he was a "New Human." He usually appeared in human form, unlike J'onn, who went everywhere with a green skull face. It was a sign of how he identified himself.
From a certain perspective, Su Ming actually shared Luthor's views. They were both Human Supremacists.
The only difference was that Su Ming had gained alien abilities through Strangle, while the latter had his Gene Sequence altered by Perpetua. Yet both had originally been ordinary humans.
Come to think of it, Batwoman was also a Human Supremacist, but she never preached her beliefs. She simply acted on them, whether it was slaughtering Darkseid's minions, preparing secret plans to exterminate entire alien races,