Magnum's sensors quickly picked up a change in the atmosphere. At that moment, something had clicked and the determiner seemed to no longer be in his grasp.
Its first decision was to immediately escape but to doubt its plan, that was a human thing to do. He had calculated the probability of success and his chances were quite high.
Was there a need to worry?... it thought otherwise. Nathan's confidence must be his ploy but to what end, he was unsure. After all, their fates had already been sealed the moment that Sonic blast was released.
It was merely a matter of time before everything was settled. Thus, it stood its ground and chose to call Nathan's bluff. [Do you think that you would fool me with your false actions?... I am a superior AI, I will not fall for your fake act.]