Marco continued his attacks aimed at Adam instinctively, and launched himself towards him, while Adam could barely move and quickly used the Step Skip Skill to act.
The moment of hesitation that Marco experienced was all Adam needed to find out what exactly Milo had done in order to make Marco suddenly go wild and increase his power like that.
If he wasn't able to end it soon, not only would he have no choice of winning against him, but Marco was also likely to suffer irreversible damage due to the strain that the power is likely to put on his body that can't handle it.
Confronting him about it and accusing him of intervening or cheating wouldn't do Adam any good and things had turned out just as he had hoped they wouldn't.
Withdrawing his Death Devouring Daggers, Adam had one chance to stop Marco in his tracks without harming him too much and while also finding how exactly Milo had managed to cheat.