It's more like when Marx has an opponent in his scanners, he rarely ever loses sight of them, and Marx's typical laser strategy is to spam them at all sides, this works especially well due to the sheer number of them, rather than the way they're moving. Even if they were all in a completely straight line, Marx would most likely uses lasers from all sides and just have them curve towards the line. It's noted in Marx's standard tactics that "He believes in outright destroying his foes through the pure power of his suit and intelligence", full body laser spams fits this perfectly. Marx's intelligence could/should help him here too.
The laser strat is also kind of like a blanket way to deal with whatever Scarlet is doing due to the laser volume
He also hardly ever uses Gravtion Palms in a way that doesn't affect the entire area round himself. But it also seems like she's somehow just able to ignore gravity in its entirety, so not even sure if Graviton Palms are that important