Meridian Station Easter Egg

On mission 4 of Halo 5 (Meridian Station) there are two miners that you can talk to on one of the rooftops. One of the guys speaks Portuguese and the other one translates (very roughly) before saying never mind or something like that. If you speak to them a second time they mention putting the alien in an arm bar. Does anybody know what the Portuguese guy is saying or what this is supposed to reference?