Image: Naughty Dog / PlayStationOfficial screenshot from Naughty Dog / PlayStation.
Live Bait is the bronze trophy for luring infected into attacking a human enemy with a thrown brick or bottle. Toss the object so its noise pulls infected toward hunters or soldiers and let them fight it out.
Look for areas where infected and hostile humans share a space. Throw the brick or bottle near the humans, not at the infected, so the infected follow the sound into them.