Well a mutant would know that because they can feel their powers being dampened, but a human wouldn’t necessarily know what the green kid’s powers are until they run some tests. Maybe this is early in the story, before the humans know what Leech can do. Maybe the orders were “collar all mutants”, and the grunts aren’t empowered to make their own decisions in the field.
That’s generally why they keep Leech around, no collars needed. He can’t control his power so it automatically nullifies everyone.
Well a mutant would know that because they can feel their powers being dampened, but a human wouldn’t necessarily know what the green kid’s powers are until they run some tests. Maybe this is early in the story, before the humans know what Leech can do. Maybe the orders were “collar all mutants”, and the grunts aren’t empowered to make their own decisions in the field.