You hold the line against the thugs, moving to a slightly safer position where you can keep yourself covered more easily even once the thugs adapt to fight the Moonbrook Brigade. This works excellently, and when the Brigade shows up, the thugs, cornered, have no choice but to either die or drop their weapons and surrender. Thankfully for you, some of them are reasonable enough to take that second option. Having multiple thugs remaining, it falls to you to find out what they know. "So," says Captain Alpert, leader of the Moonbrook Brigade, cutting off your chance to interrogate the thugs by doing it himself, "what do you know?" "Um," says one of the thugs. "We're part of the Defias?" "Yeah," says another, "it's back." "That's about it, I think," says the first, looking at the other one. "Did I miss anything?" "Well," says the other, "there was—" "Yeah yeah yeah we heard that part," says Captain Alpert. "All right, ladies and gentlemen, it now falls to us: if the Defias has reformed, we must INVADE THE DEADMINES!"
Help Captain Alpert INVADE THE DEADMINES! Ask the thugs if they know anything that they didn't tell Alpert.