To shoot from the hip means to act rashly and recklessly without consideration, which is what lemus was doing when he was firing aimlessly.
Consider the statement "I expected lemus to act rashly and recklessly without consideration, but he was firing aimlessly without holsters now.". Based on this "I expected lemus to shoot from the hip, but he was firing aimlessly without holsters now." a true statement? Yes, no, or I don't know?