The gunslinger is in his element at last, all emotion and doubt and fears about Emma-Didi-gone from his malfunctioning mind. He knows these targets, recognizes them from the skimmer that attacked them on their way to the train. The same targets, Didi believes, who killed the old man, Putter, and kidnapped her father.
He doesn't have proof of their guilt, though their attack is enough for his gunslinger sensibilities to kick in and demand action. Action. His mandate.
"Suspects," he booms in his augmented voice. "Discard your weapons and prepare to be taken into custody." His cyborg vision sharpens, studying the three as he speaks again. "Resistance to arrest will be met with lethal force."
The one in front-Jackus, according to Didi-grins while the gunslinger's programming processes his stance, the tightening of his lips and the way his hand shifts to his side where a plasma gun sits. The gunslinger takes in all of this as the suspect speaks.