I know Manta’s like well bad and all. But i have to give him his props, when it comes to family. Because he went basically halfway around the world to meet with the person who want’s his son dead. And what does he say: “NO ONE TOUCHES MY SON!”
He’s been with Kal like how long? Barely just a few months and he’s proud to call Kal his son. And now that he’s hurt and suffering, he’s there for Kal he’s really worried and will take whatever measure to get him back to his former self.
While Sportsmaster seriously just doing this for honor. Like the LIGHT and everyone else will all see him as a lower being if he doesn’t get back at Manta for “Artemis’s Death”. He has to prove himself. Whereas Manta will not let any harm come to Kal, see that’s family (in a nutshell) but that’s family.